1. Communicable Diseases
Chapter 18
Communicable Diseases
Lesson 3
Common Communicable Diseases
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2. contagious period
The length of time that a particular disease can be spread from person to person
A viral disease characterized by a severe sore throat and swelling of the lymph glands in the neck and around the throat area
mononucleosis
Click to reveal the definitions.
A viral disease of the liver characterized by yellowing of the skin and the whites of the eyes
hepatitis

3. A bacterial disease that usually affects the lungs
tuberculosis
A bacterial disease that usually affects the lungs
pneumonia
A serious inflammation of the lungs
Click to reveal the definitions.
strep throat
A sore throat caused by streptococcal bacteria

4. 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.

5. Other Common Communicable Diseases
Predicting
Look at the main headings, figures, and captions in the lesson. Predict what kind of information you think you might learn.
Major Headings in this Lesson
Colds
The Flu
Other Common Communicable Diseases

6. 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.
The common cold occurs more frequently than any other communicable disease.
Cold are caused by hundreds of different viruses.
It is important to stay home for at least 24 hours after your cold symptoms first appear because it is during this time that you are most contagious.
Stay home for at least 24 hours after cold symptoms first appear.

7. The Flu Flu Symptoms Fever and chills Headache Muscle aches
Influenza, or “the flu,” can be spread through both direct and indirect contact.
Muscle aches
Respiratory problems

8. 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.
Most strains of the flu are relatively harmless, but some can be serious.

9. 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

10. 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
Mononucleosis is also called “mono” and “the kissing disease.”
Mono most commonly infects teens and young adults.
Mono is also spread through sharing contaminated eating utensils and drinking glasses.

11. 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
Other symptoms might include loss of appetite, weakness, lack of energy, fever, headaches, and a sore throat.

12. 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.

13. Sometimes people who test positive for TB show no symptoms.
Tuberculosis
Because tuberculosis spreads easily through the air, people are regularly tested for the disease.
tuberculosis A bacterial disease that usually affects the lungs
Tuberculosis is also known as “TB.”
Even without symptoms, people who test positive for TB can still spread the disease.
Sometimes people who test positive for TB show no symptoms.

14. 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.
Symptoms of pneumonia include fever, chills, and difficulty breathing.
People infected with other diseases are especially vulnerable to pneumonia.

15. 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.

16. Strep Throat
Symptoms of strep throat include a red and painful throat, fever, and swollen lymph nodes in the neck.
Strep throat is caused by a bacteria, which is why it is easily treated with antibiotics.

17. What I Learned Vocabulary Define mononucleosis. Lesson 3 Review
Mononucleosis is a viral disease characterized by a severe sore throat and swelling of the lymph glands in the neck and around the throat area.

18. Lesson 3 Review
What I Learned
Give Examples What are two examples of how someone might become infected with hepatitis A?
by eating or drinking contaminated food or water and by being exposed to contaminated blood or body fluids

19. What I Learned List Name two symptoms of strep throat. Lesson 3 Review
Sample answer: painful throat, swollen lymph nodes, headaches, nausea, vomiting

20. Lesson 3 Review
Thinking Critically
Analyze Why are hospital patients often at risk for developing pneumonia?
People who are sick with other illnesses are especially vulnerable to pneumonia.

21. 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?
Sample answer: Someone should seek help if the symptoms are long lasting or get worse over time.

22. Communicable Diseases
End of
Chapter 18
Communicable Diseases
Lesson 3
Common Communicable Diseases
Click for:
>> Main Menu
>> Chapter 18 Assessment