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Chapter 18
Communicable
Diseases
Lesson 3
Common Communicable
Diseases
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 contagious
period
The length of time that a particular disease
can be spread from person to person
A viral disease characterized by a severe
 mononucleosis sore throat and swelling of the lymph glands
in the neck and around the throat area
 hepatitis
A viral disease of the liver characterized by
yellowing of the skin and the whites of the eyes
 tuberculosis
A bacterial disease that usually affects the lungs
 pneumonia
A serious inflammation of the lungs
 strep throat
A sore throat caused by streptococcal bacteria
In this lesson, you will learn to
 explain what causes colds and how they can be treated.
 identify some common communicable diseases.
 describe the symptoms of some common communicable diseases.
Predicting
Major Headings in this Lesson
Look at the main headings,
figures, and captions in the
lesson. Predict what kind
of information you think
you might learn.
• Colds
• The Flu
• Other Common Communicable
Diseases
Colds
When You Have A Cold
Get plenty of rest and drink lots of fluids.
Some over-the-counter (OTC) medicines can help relieve cold symptoms.
Stay home for at least 24 hours after cold symptoms first appear.
The Flu
Flu Symptoms
Fever and chills
Headache
Muscle aches
Respiratory problems
The Flu
The flu is spread by one of three main types of
influenza viruses, each with several different strains.
Scientists try to anticipate which strains will spread
fastest and create enough flu vaccines for the
following year.
Other Communicable Diseases
Often, the contagious period of a communicable
disease includes a length of time before the infected
person starts to show symptoms.
contagious period The length of time that a particular disease can
be spread from person to person
Mononucleosis
Mononucleosis is spread through contact with the
saliva of an infected person.
mononucleosis A viral disease characterized by a severe sore
throat and swelling of the lymph gland
Mono is also spread through sharing contaminated
eating utensils and drinking glasses.
Hepatitis
There are three types of hepatitis.
hepatitis A viral disease of the liver characterized by
yellowing of the skin and the whites of the eyes
Hepatitis
Hepatitis
A
• Most commonly spread through food or water that
has been contaminated with human waste.
• Vaccines can protect people from this type.
Hepatitis
B
• Most commonly spread through contact with
contaminated blood or other body fluids.
• Vaccines can protect people from this type.
Hepatitis
C
• Most commonly spread through contact with
contaminated blood or other body fluids.
• Medications can help treat people with this type.
Tuberculosis
Because tuberculosis spreads easily through the
air, people are regularly tested for the disease.
tuberculosis A bacterial disease that usually affects the lungs
Sometimes people who test positive for TB show no
symptoms.
Pneumonia
Pneumonia can be caused by a virus or bacteria.
pneumonia A serious inflammation of the lungs
Pneumonia can be spread through direct or indirect
contact.
Strep Throat
Left untreated, strep throat can lead to serious
complications, such as heart or kidney damage.
strep throat A sore throat caused by streptococcal bacteria
Strep throat is spread through direct or indirect
contact and can be easily treated with antibiotics.
Strep Throat
Symptoms of strep throat include a red and painful
throat, fever, and swollen lymph nodes in the neck.
Lesson 3 Review
What I Learned
Vocabulary Define mononucleosis.
Lesson 3 Review
What I Learned
Give Examples What are two examples of how
someone might become infected with hepatitis A?
Lesson 3 Review
What I Learned
List Name two symptoms of strep throat.
Lesson 3 Review
Thinking Critically
Analyze Why are hospital patients often at risk for
developing pneumonia?
Lesson 3 Review
Thinking Critically
Evaluate If someone has symptoms such as a fever
and fatigue, how will that person know when to seek
help from a health care professional?
End of
Chapter 18
Communicable
Diseases
Lesson 3
Common Communicable
Diseases
Click for:
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