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Epidemiology
Concepts and Terms
Homeostasis
Define
 Major systems
 Communication

Holistic View

Health vs. Disease

Wellness Model (health focus)




Awareness
Education
Growth
Treatment Model (disease focus)




Signs
Symptoms
Disability
Death
Definitions








Pathogen
Disease
Morbidity
Mortality
Symptoms
Signs
Etiology
Pathogenicity
Symbiosis
Microbiotica

Normal

Resident



Transient



Competition
Immune
Opportunistic




Acquired 1st months of life
Lifetime population
Immune suppression
Change in competition
Change site of residence
Pathogens

Contamination




Food
Air
Water
Infection
Ecological Fitness
Immune Defense
Portals of Entry


Skin
Mucous Membranes



Open body cavities
Placenta
Parenteral



SC
IM
IV
Adhesion

Adhesion factors


Protein ligands
Examples




Binding

Glycoproteins




Fimbria
Flagella
Glycocalyx
Mannose
Galactose
Each other = Biofilms
Avirulence


No adhesion factors
No binding
Disease Process





Incubation
Prodromal
Illness
Decline
Convalescence
Pathogenicity

Virulence Factors

Plasmids


Extracellular enzymes



Resistance to Ab
Coagulase
Hemolysins
Toxins

Exotoxins
 Cytotoxin
 Neurotoxin
 Enterotoxin


Endotoxins = Lipid A
Avoid phagocytosis




Capsules
Motility
Change lysosome fxn
Increased WBC destruction
Toxins
Sequella to Injury
Portals of Exit
Sources of Disease

Reservoirs

Animals



Zoonotic
Human carriers
Nonliving



Soil
Water
Food
Host Life Cycles

Life Cycle




Hosts






L1
L3
Adult
Definitive
Intermediate
Secondary
Incidental
Dead-End
Stages


Infectious
Diagnostic
Transmission of Disease

Contact




Vehicle





Direct
Indirect (Fomites)
Droplet
Air
Food
Water
Body fluids
Vector

Mechanical



Flies
Roaches
Biological



Lice
Mosquitoes
Ticks
Lyme Disease
Classification of Disease

Stages





Types




Communicable
Contagious
Non-communicable
Source



Acute
Chronic
Subacute
Latent
Primary
Secondary
Region



Local
Systemic
Focal
Disease Diagnosis

5 Components





Epidemiology
Etiology
Pathophysiology
Clinical Manifestations
Outcome
“COPE”
Koch’s Postulates





1) Pathogen for every disease
2) Isolate and grown in pure
culture
3) Cause disease in healthy
susceptible host
4) Reisolate pathogen from
experimental host
Exceptions



Culture issues (temp, pH, O2)
Multifactoral causes
Ethical concerns (primates)
Epidemiological Approaches

Descriptive


Analytical



Disease data
Koch’s Postulates
Retrospective
Experimental

Testing hypothesis
Epidemiology

Epidemiology
 Define
 Factors
 Predisposing
 Precipitating
 Questions
 Where, When, How, Why,
and Who
 Related Terms
 Frequency
 Incidence
 Prevalence
 Outcomes
 Morbidity
 Mortality
 Geography
 Endemic
 Epidemic
 Pandemic
 Sporadic
Herpes D Virus (HDV)
Hospital


Nosocomial
Sources



Exogenous
Endogenous
Iatrogenic
CDC Reportable Diseases (examples)



Viral /Bacterial

HIV

Anthrax

Influenza

Pertussis, Diphtheria

TB, Leprosy

Botulism, Tetanus

Hepatitis

E. coli, Salmonella, Shigella

STDs

Cholera

Mumps, Measles, Rubella

Legionella

Small Pox

Tularemia

Toxic Shock

Leptospirosis
Vector Borne

Lyme

Plague

RMSF

Ehrlichia

Malaria, Yellow Fever
Zoonotic

Rabies

Brucellosis

Cryptosporosis

Toxoplasmosis
Public Health Groups



CDC
WHO
US Departments


Agriculture
Health
Biohazard Risk Groups
Major Etiologic Categories

Genetic





Acquired





Sickle Cell Anemia
CF
MD
Hemophilia A
Infectious
Traumatic
Iatrogenic
Nosocomal
Multifactoral






CAD
DM
Cancer
Congenital Heart Disease
Hypertension
Emphysema
Various Classification of Disease

Anatomical



Developmental (age)






Organ
System
Neonatology
Pediatrics
Adolescent
Adult
Geriatrics
Etiological
Etiology, DAMNIT ! (DAMNIT-V)
D = Degenerative, Developmental
 A = Anomaly, Accident, Autoimmune
 M = Metabolic, Mechanical, Mental
 N = Neoplasia, Nutrition, Neurological
 I = Infectious, Immune, Iatrogenic,
Idiopathic, Inherited, Inflammatory,
Ischemic
 T = Trauma, Toxins, Toxicities
 V = Vascular

My Possible Problem List

Location
Gross
Histological
Physiological

Remember: DAMNIT-V



Clinical Manifestations

Symptoms /Syndrome




Signs




Patient Report
Subjective
Related Terms:
Prodromal, Insidious,
Latent
Health care exam
Observable phenomena
Objective
Diagnostic Criteria



Laboratory results
Imaging
Biopsy
Digital Thermal Imaging
Medical Records




S
O
A
P
Outcome

Expected


Prognosis
Actual







Cure
Remission
Exacerbation
Complication
Sequella
Palliative
Death
Stress



Define
Stressor examples
 Positive
 Negative
 Types
 Major
 Minor
 Symptoms
GAS
 Alarm (ANS)
 Resistance (H-P-A axis)
 Exhaustion (+ feedback)
Stress Related Disorders










Immune: Autoimmune, Neoplasia
Cardiovascular: HT, CAD, Dysrhythmias
Respiratory: Asthma, URTI, TB
Renal: Interstitial cystitis
Neurologic: Depression, MS, Headache
GI: Diarrhea, IBS, Eating Disorders
Endocrine: DM, Hyperthyroidism
Reproductive: Infertility
Musculoskeletal: RA, SLE, Chronic Fatigue
Integumentary: Eczema, Acne, Urticaria, Herpes
Adaptation


Define
AKA






Compensatory mechanisms
Homeostatic Mechanisms
Control Systems
Regulatory systems
Homeostatic Control and
Feedback
Limits



Energy use
Efficient (overshoot,
undershoot)
Effective (prolonged response
 change feedback)
De-stress
Sleep
 Exercise
 Diet
 Medical Check-ups
 Energy
 Attitude

Stressed is Desserts spelled backwards!
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