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126-1 SKIN AND SOFT TISSUE INFECTION (SSTI) A Pain in the Butt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level II CASE SUMMARY A 19-year-old college student presents to the ED with a new-onset “boil” on his right buttock. This boil is secondary to sports-related trauma. He was seen at the student health center, where his wound was cleaned and he was given a prescription for clindamycin 300 mg PO QID (PCN allergy). He was nonadherent to the clindamycin due to nausea and the QID schedule. About a week later, he returned to the student health center and was ultimately sent to the ED for further evaluation and treatment of his continued skin and soft tissue infection (SSTI). At the ED, he had the abscess area drained via incision and drainage (I&D) and was sent home with wound care instructions only. He returned to the ED 8 days later with a recurrent boil in the same area. He is afebrile (37.7°C); all vital signs are stable and a second I&D was performed. The fluid from the second I&D was sent for culture and sensitivity; he had his nares and groin areas swabbed for methicillin-resistant Staphylococcus aureus (MRSA) and blood cultures drawn, all of which are pending. The MRI of the gluteal area was negative for signs of deep tissue infection, and it was determined that the patient did not need to be admitted; however, an antibiotic was warranted in this recurrent infection case. The patient was considered to have a purulent SSTI, with the most likely organism being S. aureus and methicillin-resistant S. aureus (MRSA) as the predominant pathogen on the first episode. Since the patient presented with a mild SSTI I&D alone can be considered an appropriate treatment regimen (studies and discussion below). On recurrence, it is assumed that it is again S. aureus and methicillinresistant S. aureus (MRSA) that was reintroduced into the wound, from either improper hygiene or organism colonization of the skin. The wound was again drained and all the appropriate cultures were drawn, and the clinical condition of the patient (afebrile with no extension of the infection outside of the local area) would now be considered a moderate infection and would still necessitate only outpatient treatment; however, an oral antibiotic should be recommended in addition to the I&D for treatment and eradication of the organism. The reader(s) should discuss the relative value of minimally invasive surgical interventions (I&D) and antibiotic therapy at the time of initial presentation, as well as consider nonpharmacologic strategies for the treatment of a purulent SSTI. Furthermore, the same discussion should be repeated after reviewing the Casebook section “Clinical Course” in this case, but the focus should be more on the value of antibiotic management, the treatment options, and follow-up evaluation of the culture data (particularly the fluid). In addition, the reader(s) should discuss different decolonization strategies for nares and/or groin positive MRSA swabs (screens) for this patient case. Problem Identification 1.a. Classify this patient’s SSTI as purulent or nonpurulent and either: mild, moderate, or severe. Classification of SSTI: • Purulent SSTI: ✓Cutaneous abscesses are collections of pus in the dermal layer any beyond.1 ✓Furuncles are infections surrounding the hair follicle in which pus can extend to the subcutaneous tissue and typically result in a relatively small abscess, where a small abscess forms.1 ✓Carbuncles are larger than furuncles in which a collection of adjacent hair follicles become infected and the fluid collections merge together to form a large abscess.1 • Nonpurulent SSTI: ✓ Infections that do not have any associated pus; (ie, infections where there is a focal fluid collection and surrounding erythema, often called cellulitis, would be considered purulent). ✓Cellulitis is a diffuse spreading infection of the dermis and beyond that is red, warm and tender with no definitive border.1,2 ✓Erysipelas is similar in presentation to cellulitis, and is most commonly associated with the face only, but has a well demarcated border.1,2 ✓Cellulitis and erysipelas are synonymous in some literature.1 • Mild ✓The absence of systemic signs of infection1 • Moderate1 ✓The presence of systemic signs of infection, but not otherwise clinically stable and not meeting the severe critieria.1 • Severe purulent infections1 ✓ Failed incision and drainage plus oral antibiotics or the presence systemic signs of infection such as: temperature >38°C, tachycardia (heart rate >90 bpm), tachypnea (respiratory rate >24 breaths per minute) or abnormal white blood cell count (>12,000 cells/mm3 or <4000 cells/mm3 or immunocompromised patients).1 • Severe nonpurulent infections1: ✓Failed oral antibiotic treatment or the presence systemic signs of infection (defined above), or immunocompromised, or those with deeper tissue involvement as evidenced by: bullae, skin sloughing, hypotension, or organ dysfunction.1 The classification of Jimmie’s cellulitis at his initial presentation to student health would be considered mild and there is insufficient evidence to know if purulence was present. His return to the student health center and referral to the ED due to the lack of response to oral clindamycin is driven by his noncompliance and the development of a purulent infection (which could have been present initially) would indicate the need for I&D (which is considered a standard of care), and should not escalate diagnosis. The severity of Jimmie’s purulent SSTI would be classified as mild (no true systemic manifestations). Keep in mind his infection has not been adequately treated until he received the initial I&D in the ED. Copyright © 2017 by McGraw-Hill Education. All rights reserved. Skin and Soft Tissue Infection (SSTI) Jarrett R. Amsden, PharmD, BCPS QUESTIONS CHAPTER 126 126 126-2 SECTION 16 1.b.What subjective and objective clinical data are consistent with the diagnosis of purulent SSTI? • Pain, irritation, and swelling in right gluteal area secondary to a trauma. • Right gluteal area: red, erythematous, warm, and tender to touch; localized fluid collection that appears fluctuant, consistent with a carbuncle and surrounding erythema. • Large 2 × 4 cm red swollen area over the right buttock, a localized fluid collection and surrounding erythema. Infectious Diseases • Low-grade temperature (37.5°C [99.5°F]). • White blood cell (WBC) 11.3 × 103/mm3 (slightly elevated, but not meeting the definition of systemic sign of infection). 1.c. What are the most common causative organisms of a purulent vs nonpurulent SSTI? • Purulent SSTI: ✓Methicillin-sensitive S. aureus (MSSA) or methicillin-resistant S. aureus (MRSA) (in particular, the community-associated MRSA (CA-MRSA) phenotype: retains susceptibility to trimethoprim-sulfamethoxazole (TMP-SMX), doxycycline or minocycline, and sometimes clindamycin).1,2 • Nonpurulent SSTI: ✓Group A (β-hemolytic) streptococci (Streptococcus pyogenes); less common streptococci are groups B, C, and G (sources unclear, but are typically seen in domestic nonhuman animal species (horses, dogs, etc.).2 ✓Methicillin-sensitive S. aureus (MSSA) for moderate and severe infections. Desired Outcome 2.a. What are the goals of nonpharmacologic management of this patient’s SSTI? • Drainage or incision and drainage (I&D) of the wound is imperative. (If there is fluid, drain it!) • Reduce pain, swelling, and erythema in the right buttock to relieve pain associated with sitting and allow the patient to attend class. • Dress the wound to prevent tearing or continual opening of the wound as well as reinfecting or reinoculating the wound. • Reduce temperature (while not febrile, the patient does report febrile episodes). 2.b. What are the goals of pharmacotherapy for the treatment of this patient’s SSTI? • With the initial presentation to the ED, I&D alone (no additional antibiotic therapy) is sufficient since the patient would be categorized as mild. • Drain the abscess—the Infectious Diseases Society of America (IDSA) guidelines for the treatment of skin and soft tissue infections1 and MRSA3 recommend I&D for all purulent abscesses, if amenable to this intervention. • Reduce temperature (while not febrile, the patient does report febrile episodes). • Restore patient’s activities of daily living and attendance of classes. Therapeutic Alternatives 3.a. Create a list of nonpharmacologic treatment or supportive options for this patient in the treatment of SSTI. • Purulent SSTIs, that are not drained or nonpurulent SSTIs: Copyright © 2017 by McGraw-Hill Education. All rights reserved. ✓In mild-to-moderate and even severe cases, the patient may benefit from cool sterile saline dressings initially to reduce pain, followed by warm, moist heat to aid in localization and allow spontaneous drainage.1,2 ✓Elevation and immobilization may reduce the edema and swelling; however, in this case, given the location, elevation and immobilization are not likely to be feasible. Reduced pressure (load bearing) on the buttock area would also be beneficial. ✓Local wound care is typically not necessary unless there is exudate. • Drainage or incision and drainage [I&D] of furuncles and carbuncles: ✓ In all types of purulent cellulitis, adequate drainage (I&D) of the fluid collection is considered the standard of care.1–3 For smaller fluid collections, application of warm compresses to induce spontaneous drainage is recommended.1–3 For larger fluid collections, I&D of the wound should be employed if these are in areas easily accessed.1–4 This is generally not necessary or possible in typical uncomplicated cellulitis cases (no fluid focus to be drained),1 but is more commonly encountered in MRSA SSTIs.1–4 ✓Topical wound care with dry, gauze dressings are typically adequate and less expensive; occlusive dressings can also be considered but are usually more expensive and were not associated with improved healing after surgery. ✓Topical dressings also provide a protective barrier against reinoculation or reintroduction of the infective organism(s).1,2 ✓The addition of topical antimicrobial therapy (eg, silver sulfadiazine, povidone–iodine) may also be considered, but is not required. • MRSA infections are prevalent in patients who are otherwise healthy.2,4 These infections are usually purulent and should be drained if possible.1–4 Of note, MRSA lesions may present as a “boil,” cutaneous abscess, furuncle or carbuncle that can be progressive and move from site to site. In such cases, surgical debridement is required for successful outcomes.1–4 3.b.What feasible oral antimicrobial options are available for the treatment of purulent and nonpurulent SSTIs? • As highlighted above (see the section “Problem Identification”), the most common pathogens in cases of purulent SSTIs are S. aureus, both methicillin-sensitive and methicillin-resistant.1 As severity and patient complexity increases, other less commonly associated pathogens include other gram-positive (+) cocci, some gram-negative (–) bacilli, and anaerobes. The latter organisms are often found in specific patient populations (ie, diabetes mellitus or immunocompromised) or necrotizing and hospital-acquired cases of SSTIs.1,2 • The treatment of purulent infections with antibiotics (active against MRSA) is controversial.1–3 Some believe simple surgical drainage is adequate, while others believe I&D + antimicrobial therapy is necessary. The IDSA guidelines for the treatment of skin and soft tissue infections and MRSA1,3 recommend antibiotic therapy in addition to I&D when the following conditions are present: ✓Severe or extensive disease (multisite) or rapid progression in the presence of associated SSTI ✓Presence of systemic signs and symptoms ✓ Presence of medications immunosuppressive comorbidities or 126-3 ✓Multiple abscesses or those in a difficult area to drain ✓Associated septic phlebitis Empiric antibiotic selection: • Mild purulent SSTIs ✓Trimethoprim–sulfamethoxazole (TMP-SMX) 1–2 double strength (DS) tablets PO BID • Due to the limited clinical data with TMP-SMX in the treatment of streptococci, current guidelines suggest adding a beta-lactam to TMP-SMX when both streptococci and MRSA are suspected; however, in nonpurulent infections the beta-lactam alone would be sufficient.1 • Of note, the use of TMP-SMX 2 DS tablets (high dose) was largely utilized due to the reduced activity against streptococci. Stein and colleagues5 demonstrated excellent tissue concentrations and subsequent bactericidal activity against both S. aureus and Group A (β-hemolytic) streptococci with both 1 and 2 DS tablet doses. ✓Doxycycline 100 mg PO BID • Due to the limited clinical data with doxycycline in the treatment of streptococci, current guidelines suggest adding a beta-lactam to doxycycline when both streptococci and MRSA are suspected; however, in nonpurulent infections the beta-lactam alone would be sufficient.1 ✓All the empiric antibiotic choices listed above would be considered appropriate for penicillin allergic patients • Mild nonpurulent SSTIs ✓In patients with a nonimmediate or nonanaphylactic penicillin allergy, cephalexin may be the first alternative.1,2 ✓In cases of true penicillin allergy (immediate or anaphylaxis), clindamycin is recommended.1,2 ✓Clindamycin 300–450 mg PO TID-QID; doses >450 mg TID are often not tolerated due to N/V. Organism-specific antimicrobial selection: • S. pyogenes:1–2 ✓Mild: ■■ Penicillin VK 250–500 mg PO QID ■■ Amoxicillin 500 mg PO TID • Methicillin-sensitive S. aureus (MSSA):1–2 ✓Mild ■■ Dicloxacillin 250–500 mg PO QID ■■ Cephalexin 500 mg PO TID–QID • MRSA:1–4 ✓Mild: ■■ Trimethoprim–sulfamethoxazole one to two DS tablets PO BID ■■ Doxycycline 100 mg PO BID ■■ Minocycline 100 mg PO BID ■■ Linezolid 600 mg PO BID—most expensive option ■■ Clindamycin 300–450 mg PO TID-QID: doses >450 mg TID are often not tolerated due to N/V ✓Minocycline 100 mg PO BID ✓Linezolid 600 mg PO BID ✓Clindamycin 300–450 mg PO TID-QID; doses >450 mg TID are often not tolerated due nausea and vomiting (N/V) • MRSA strains have demonstrated increasing resistance to clindamycin (geographically variable), particularly in adults (~50% resistant). • In all cases, culture and susceptibility results should be followedup on and antibiotic therapy should be tailored to these results. The process for this follow-up is often sporadic and pharmacists (particularly those in the ED) can aid in making sure patients get the most appropriate antibiotic therapy based upon culture and susceptibility results. • Mild nonpurulent SSTIs: or first-generation ■■ Dicloxacillin 500 mg PO QID ■■ Cephalexin 500 mg PO TID–QID ■■ Cefadroxil 0.5–1 g BID (can be used in place of cephalexin) • Both dicloxacillin and cephalexin have activity against the primary gram-positive pathogens (Group A (β-hemolytic) streptococci (Streptococcus pyogenes) and methicillin-sensitive S. aureus).1–3 • For mild nonpurulent SSTIs dicloxacillin is considered the first-line antimicrobial agent due to the robust amount of literature. However, cephalexin regimen may be more conducive ✓MRSA strains have demonstrated increasing resistance to clindamycin (geographically variable), particularly in adults (~50% resistant). ✓In all cases, culture and susceptibility results should be followed-up on and antibiotic therapy should be tailored to these results. The process for this follow-up is often sporadic and pharmacists (particularly those in the ED) can aid in making sure patients get the most appropriate antibiotic therapy based upon culture and susceptibility results. • Anaerobes:2 ✓ In Jimmie’s case we would not have any suspicion for anaerobic organisms, but these were included to make the potential discussion complete. ✓In cases where anaerobes are thought to be potential causative pathogens, antibiotic classes listed as follows have good anaerobic activity without adding additional agents such as metronidazole or clindamycin. • β-Lactam + β-lactam inhibitor combinations (ie, amoxicillin/ clavulanate) ✓In cases where anaerobes are thought to be potential causative pathogens, the following agents should have metronidazole or clindamycin added. • β-Lactams alone ✓Clinical pearl: Above the diaphragm (noncentral nervous system [CNS]) Copyright © 2017 by McGraw-Hill Education. All rights reserved. Skin and Soft Tissue Infection (SSTI) • Jimmie’s infection could arguably be considered progressive, but his continued infection has not been adequately treated due to noncompliance with clindamycin and he has not had a surgical intervention until his presentation to the ED. He also displays some precursor systemic signs and symptoms of infection, but again his infection is just being adequately treated for the first time in the ED and he is otherwise clinically stable. penicillin Penicillin allergy: • Mild purulent SSTIs ✓Lack of response to I&D alone ✓ Penicillinase-resistant cephalosporin1–3: to promoting adherence and has been demonstrated to be effective.3 CHAPTER 126 ✓Extremes of age 126-4 • Clindamycin 300–450 mg PO TID–QID SECTION 16 ✓Clinical pearl: Below the diaphragm or CNS • Metronidazole 500 mg PO TID–QID Optimal Plan 4.a.What is the most appropriate treatment course for this patient (pharmacologic vs nonpharmacologic)? Infectious Diseases • Surgical debridement I&D is considered the standard of care for any large focal area of fluid collection on the skin (carbuncles and furuncles, often called “boils”) and is necessary for this patient.1–4 • The addition of antibiotics to surgical debridement (I&D) is controversial. In studies, the cure rates of surgery alone exceeded 85% irrespective of active or any antibiotic therapy. In this case, the absence of systemic symptoms and lack of extensive cellulitis would make surgical debridement an adequate single therapy option.6,7 • The treatment of purulent infections with antibiotics (active against MRSA) is controversial.1–3 Some believe simple surgical drainage is adequate, while others believe I&D + antimicrobial therapy is necessary. The IDSA guidelines for the treatment of skin and soft tissue infections and MRSA1,3 recommend antibiotic therapy in addition to I&D when the following conditions are present: (refer to Question 3.b). 4.b.What antimicrobial agent (or agents), dosage form, dose, schedule, and duration of therapy are best for this patient? • According to the IDSA guidelines for the treatment of skin and soft tissue infections and MRSA,1,3 Jimmie would be an ideal patient to undergo I&D alone. However, you could make an argument for progression of his infection or some precursor signs of systemic manifestations that could warrant the addition of antibiotics. If antibiotics were added after the I&D: ✓Trimethoprim–sulfamethoxazole one to two DS tablets PO BID ✓Doxycycline 100 mg PO BID ✓Minocycline 100 mg PO BID ✓Linezolid 600 mg PO BID ✓Clindamycin 300–450 mg PO TID-QID • This could still be a viable treatment option, but Jimmie has already reported noncompliance with this regimen due to its frequency and N/V.1 Treatment duration: • Mild purulent SSTI (for this patient case): ✓Five day duration is the minimum, but treatment can be extended if the SSTI has not improved by day 5 (5–10 days pending clinical response)1–3 4.c. Was drainage or I&D alone an appropriate management strategy for the initial presentation of this patient case? • Surgical debridement (I&D) is considered the standard of care for any large focal area of fluid collection on the skin (carbuncles and furuncles, often called “boils”).1–3 At Jimmie’s first presentation to the ED, I&D alone was a reasonable treatment option. Now that Jimmie is returning with a recurrent purulent SSTI, despite I&D, antibiotics in addition to a repeated I&D are warranted.1–2 4.d. Based on the above information, the patient has failed oral clindamycin (arguably) and an initial I&D. Does this patient need antibiotic therapy in addition to the second I&D and if so, what antimicrobial regimen would you now recommend Copyright © 2017 by McGraw-Hill Education. All rights reserved. for this patient? (Please specify dose, schedule, and duration of therapy.) • Antibiotic therapy in addition to a repeat I&D is recommended after lack of response to an initial I&D alone.1 Other criteria also warrant the addition of antibiotic therapy after I&D (refer to Question 3.b). • Acceptable antibiotics should target MRSA and any of the following would be acceptable; however, trimethoprim– sulfamethoxazole (Bactrim) has routinely been the most active antibiotic to date.1–4 ✓Trimethoprim–sulfamethoxazole one to two DS tablets PO BID ✓Doxycycline 100 mg PO BID ✓Minocycline 100 mg PO BID ✓Clindamycin 300–450 mg PO TID–QID ✓Linezolid 600 mg PO BID • In all cases, culture and susceptibility results should be followed-up on and antibiotic therapy should be tailored to these results. The process for this follow-up is often sporadic and pharmacists (particularly those in the ED) can aid in making sure patients get the most appropriate antibiotic therapy based upon culture and susceptibility results. Treatment duration: • Mild or possibly moderate purulent (or recurrent) SSTI (for this patient case): ✓Five to 10 days (pending clinical response)1,2 4.e.What are some nonpharmacologic (focus on hygiene or environmental) measures (outside of proper local/wound care) you could recommend for Jimmie to use at home/ school/in the locker room? • The spread of MRSA is common to athletes, other individuals who share common environments (jails and military quarters), household contacts, intravenous drug users (IVDU), and men who have sex with men (MSM).1,4,8 The most common method by which MRSA causes infection is via the skin; thus, breaks in the skin barrier (athlete’s foot, in Jimmie’s case) are often the entry point for infection. The spread of MRSA is attributed to its colonization of the nares, but also its prevalence in non-nasal sites such as the axilla, groin, and rectal areas.8 To further aid its spread from person to person, MRSA is known to contaminate solid surfaces, towels, razors, and other commonly touched site/objects (collectively referred to as fomites).8 Taken together, these risk factors and exposures have made it relatively easy for MRSA to become an epidemic.8 • To educate the public on the risk factors for MRSA, the five “Cs” were created: (1) contact (direct skin–skin contact); (2) cleanliness; (3) compromised skin integrity; (4) contaminated objects, surfaces, and items; and (5) crowded living conditions.9 Thus, measures to control each aspect of these risk factors are recommended for the prevention and spread of MRSA. For athletes in particular, the following recommendations were made9: 1. First aid training. 2. Encourage good hygiene. a. Hand washing after communal surface contact and person-to-person contact b. Showering after activities 3. Clean and cover all skin wounds, scrapes, and other injuries where the skin is not intact. 126-5 b. Encourage athletes to report such injuries. c. Consider treating any cases of athlete’s foot to reduce potential portals of entry. 4. Do not share towels or personal items; routinely clean mats, equipment, communal showers/baths/whirlpools, etc. • Jimmie, specifically, should be encouraged to: 1. Take the full course of his antibiotic. 2. Practice good hand washing before and after his wound care. 3. Use antimicrobial soaps/detergents and good hand washing in all instances. 4. Wash towels, sheets, and clothing in hot water cycles. 5. Not share or use anyone else’s personal hygiene items or communal hygiene items. 6. Wipe down all communal surfaces with antibacterial products or diluted bleach products (counters, phones, doorknobs, remote controls, and gaming consoles). 7. Bring attention of his wound to his coach for proper environmental decontamination and limit contact with other players as necessary. 4.f. What decolonization measures could be considered for Jimmie, if his nares and/or groin culture(s) is/are positive for MRSA? (Please discuss the relative options for both, if you would treat them differently.) • Decolonization of everyone is impractical and not recommended. However, decolonization of selected patients with recurrent MRSA infections or a closely defined group of patients (household contacts, athletic teams, etc.) may be of value.1,2 Strategies to decolonize patients have ranged from topical methods to the use of systemic antibiotics. Each modality has its pros and cons, but all have been associated with reducing the recurrence of MRSA infections in some manner.10 The most commonly employed method consists of two therapies: (1) topical mupirocin (Bactroban) locally to the nares; (2) chlorhexidine 4% scrub to the entire body. While only mupirocin is FDA indicated for MRSA decolonization, the use of both modalities has been the most successful at reducing MRSA recurrences or infections.10 Other methods have been utilized successfully, but the use of mupirocin to the nares and chlorhexidine scrub to the entire body is the consensus recommendation from an expert panel for recurrent infections or close contact outbreaks.1,8 Mupirocin ointment to the nares would be the best agent for decolonizing a person with a positive nasal swab; however, this alone has been associated with failure because MRSA does not solely colonize the nares.10 Likewise, the use of only the chlorhexidine scrub for any non-nares swab culture (groin in this case) would not be considered optimal given that up to 30% of patients may have MRSA colonization of their nares. Given the propensity for MRSA to colonize many distinct body sites, a multifaceted approach to decolonization makes the most sense for patients with recurrent infections or close contact outbreaks, even if only one swab culture is positive.1,3,10 Case readers may refer to McConeghy et al.10 for a complete list of potential decolonizing agents. 5.What clinical and laboratory parameters are necessary to evaluate the therapy for its effectiveness in treating this patient’s SSTI? • Monitor for decreased pain, inflammation, and redness in right gluteal area as well as ability to perform ADLs, such as attending class. • Monitoring patient-reported symptoms would be appropriate. Provide the patient with a thermometer to aid in truly discerning a febrile episode. (Keeping a detailed diary of any recurrent episodes could be considered, although not likely in this patient case.) • Check culture and sensitivity results so that empiric antibiotics can be tailored to the organism(s) causing the infection, if necessary. It is likely that any of the four primary agents (trimethoprim–sulfamethoxazole, doxycycline, minocycline, or linezolid) should be active in the majority of MRSA cases. Clindamycin would not be wise given the patient’s report of intolerance (nausea and vomiting). • Initiate proper wound care and dressing changes as needed, and take adequate measures to keep the wound area covered and protected until the skin is fully healed and intact. • Some sort of medical follow-up should be considered. This could be done through the student health center, a primary care appointment, or a team physician. Patient Education 6.What information should be provided to the patient to ensure successful therapy? Mr Chipwood, since you have had multiple infections and they required surgical care, you are going to need to know how to care for these wounds so that they heal properly. • The wounds need to remain dry and sterile using local wound care as prescribed. • You are going to have to change the bandages twice daily. Please be sure to wash your hands prior to caring for the wound in any way and also afterwards to prevent the spread of the organism. • The physician has prescribed trimethoprim–sulfamethoxazole, one DS tablets twice daily. The key to this therapy is that you must take it twice daily at the same time each day, and it is extremely important that you do not miss any doses. • If you experience changes in your urination habits (going more frequently, hard to start, or changes in color), this can be a sign of an adverse reaction in the kidney and you should contact your physician or go to the emergency room if this occurs. This is a rare but serious effect. You should drink plenty of water with each dose of this medication and throughout the day. • Also, since you are an athlete and will be outside for sporting events, you should wear protective sunscreen with at least a sun protection factor (SPF) of 30 or higher. This medication can make you more susceptible to sunburns, so sunscreen is recommended. • You are going to need a follow-up appointment near the end of completion of your antibiotic course to ensure you are making good progress and so we may determine whether antibiotics can be safely stopped. This appointment will be made through the student health center, and here is the appointment reminder card. • It is also very important to take the proper steps to reduce your skin colonization and nose colonization with MRSA. Copyright © 2017 by McGraw-Hill Education. All rights reserved. Skin and Soft Tissue Infection (SSTI) 5. Communal living conditions are an environment for spread. While these cannot be eliminated, better focused attention to the hygiene of the individuals and environment can minimize risk for acquisition and/or spread of infection. Outcome Evaluation CHAPTER 126 a. Exclude athletes from activities while infectious wounds are open. 126-6 SECTION 16 Infectious Diseases This is typically not detrimental and will go away with time, but since you have had a second bout with this same problem we are going to ensure we “decolonize” you appropriately. You have a prescription for nasal Bactroban. You will need to apply this ointment with a Q-tip (cotton swab) into each nostril of your nose twice daily for 5 days. You will need to make sure to get the ointment as far up into your nose as possible. It will possibly hurt and make your eyes water, but this is normal and can be a good sign you are getting deeper into the nostril. Do not force the Q-tip too far to cause excessive pain or bleeding, as this is not optimal. A second measure we recommend you take is to bath in a chlorhexidine scrub (Hibiclens) at least three times per week, preferably daily until the scrub is gone. This scrub could cause a burning sensation in your wound area, but this should be only minimal and limited. Ideally, you should keep your wound covered during bathing to promote adequate healing. These two methods will help ensure that your skin is free of the germ and that your wound will not become reinfected. • A final measure will be to employ some enhanced hygiene measures while your wound is open. These include washing all sheets, bed linens, towels, and any other linens in a hot cycle (>120°F) before using again. This should be done each time the item is washed. Second, you should disinfect all your surfaces of your room, bathroom, and other living and showering quarters with a diluted bleach solution (one teaspoon per gallon of water) or an antibacterial cleanser. This cleansing should also include doorknobs, razors, phone receivers, remote controls, gaming consoles, and other items or areas that are commonly touched. These steps will ensure your living conditions are also decolonized. • All of these measures may seem cumbersome, but these are the necessary steps needed to prevent your infection from recurring. It would also be advisable to discuss procedures for the cleaning of your facilities with your coach to prevent any further infections to you or your teammates. Copyright © 2017 by McGraw-Hill Education. All rights reserved. REFERENCES 1. Stevens DL, Bisno AL, Chambers HF, et al. Practice guidelines for the diagnosis and management of skin and soft tissue infections: 2014 Update by the Infectious Diseases Society of America. Clin Infect Dis 2014;59:e10–52. 2. Stevens DL, Bisno AL, Chambers HF, et al. Practice guidelines for the diagnosis and management of skin and soft-tissue infections. Clin Infect Dis 2005;41:1373–1406. 3. Liu C, Bayer A, Cosgrove SE, et al. Clinical practice guidelines by the Infectious Diseases Society of America for the treatment of methicillinresistant Staphylococcus aureus infections in adults and children. Clin Infect Dis 2011;52:1–38. 4. Stryjewski ME, Chambers HF. Skin and soft-tissue infections caused by community-acquired methicillin-resistant Staphylococcus aureus. Clin Infect Dis 2008;46:S368–S377. 5. Stein GE, Throckmorton JK, Scharmen AE, et al. Tissue penetration and antimicrobial activity of standard- and high-dose trimethoprim/ sulfamethoxazole and linezolid in patients with diabetic foot infection. J Antimicrob Chemother 2013;68:2852–2858. 6. Ruhe JJ, Smith N, Bradsher RW, et al. Community-onset methicillinresistant Staphylococcus aureus skin and soft-tissue infections: impact of antimicrobial therapy on outcome. Clin Infect Dis 2007;44:777–784. 7. Rajendran PM, Young D, Maurer T, et al. Randomized, double-blind, placebo-controlled trial of cephalexin for treatment of uncomplicated skin abscesses in a population at risk for community-acquired methicillin-resistant Staphylococcus aureus infection. Antimicrob Agent Chemother 2007;51:4044–4048. 8. Miller LG, Diep BA. Colonization, fomites, and virulence: rethinking the pathogenesis of community-associated methicillin-resistant Staphylococcus aureus infection. Clin Infect Dis 2008;46:752–760. 9. Barrett TW, Moran GJ. Update on emerging infections: news from the Centers for Disease Control and Prevention. Methicillin-resistant Staphylococcus aureus infections among competitive sports participants—Colorado, Indiana, Pennsylvania, and Los Angeles County, 2000–2003. Ann Emerg Med 2004;43:41–45. 10. McConeghy KW, Mikolich DJ, LaPlante KL. Agents for the decolonization of methicillin-resistant Staphylococcus aureus. Pharmacotherapy 2009;29:263–280.