2. Lesson 3 Common Communicable Diseases When you have a cold, the best thing to do is rest, eat nutritious foods, and drink plenty of fluids such as water or fruit juice. How do these strategies help your body fight cold viruses?

3. Lesson 3 Lesson Objectives Explain the causes, transmission, symptoms, and treatment of several communicable diseases Develop strategies to reduce the risk of contracting some communicable diseases Examine the ways technology impacts world health status In this lesson, you will learn to:

4. Lesson 3 Preventing Respiratory Illnesses Avoid close contact with people who are infected. Wash your hands often. Keep your hands away from your eyes and nose. Keep your immune system healthy. Avoid smoking. Respiratory Infections

5. Lesson 3 Diseases of the Respiratory Tract Common Cold InfluenzaPneumonia Strep Throat Tuberculosis Respiratory Infections

6. Lesson 3 Common Cold The common cold is a viral infection that causes inflammation of the mucous membranes that line the nose and throat. Symptoms include a runny nose, sneezing, and sore throat. The most common way of getting a cold is from rubbing your nose after picking up the virus directly through hand- to-hand contact or indirectly by handling a contaminated object. Often treatment includes the use of analgesics. Respiratory Infections

7. Lesson 3 Influenza Influenza, or the flu, is a viral infection of the respiratory tract. Symptoms of flu include high fever, fatigue, headache, muscle aches, and cough. It is most often spread through airborne transmission but also may spread through direct or indirect contact. Antiviral drugs for treatment of the flu are available but need to be given as soon as the illness arises. Respiratory Infections

8. Lesson 3 Pneumonia Viral pneumonia is relatively short-lived and produces symptoms similar to those of influenza.pneumonia Antiviral drugs are used in some cases. Bacterial pneumonia can be treated with antibiotics if diagnosed early. The bacteria that cause pneumonia are often present in healthy throats. When body defenses are weakened in some way, the bacteria can get into the lungs and multiply. Respiratory Infections

9. Lesson 3 Strep Throat Strep throat is a bacterial infection spread by direct contact, often through droplets that are coughed or sneezed into the air. Symptoms of strep throat include a sore throat, fever, and enlarged lymph nodes in the neck. Untreated, strep throat can lead to serious complications, including inflammation of the kidneys and rheumatic fever, which can cause permanent heart damage. Strep throat can be treated with antibiotics. Respiratory Infections

10. Lesson 3 Tuberculosis Tuberculosis, or TB, is a bacterial disease that usually attacks the lungs. Symptoms include fatigue, coughing (sometimes coughing up blood), fever, night sweats, and weight loss. TB is spread through the air when a person with the disease coughs or sneezes. Some strains have developed resistance to antibiotics. Respiratory Infections

11. Lesson 3 Hepatitis is inflammation of the liver. It can be caused by drug or alcohol use and by many different pathogens. Hepatitis The hepatitis A virus is most commonly spread through contact with the feces of an infected person. Symptoms of hepatitis A may include fever, nausea, vomiting, fatigue, abdominal pain, and jaundice.jaundice Practice careful handwashing and avoid close contact with people who are infected. Hepatitis A Hepatitis B Hepatitis C Types of Hepatitis

12. Lesson 3 Other Common Communicable Diseases Other Diseases

13. Lesson 3 Emerging Diseases Some diseases have been effectively controlled with the help of modern technology such as antibiotics and vaccines. Yet new diseases, such as AIDS and Lyme disease, are constantly appearing. Others, such as malaria and tuberculosis, are occurring in forms that are resistant to drug treatments. Emerging Infections

14. Lesson 3 Contributing Factors Many factors are contributing to the development of emerging infectionsemerging infections. Some of these factors include the following: Transport across borders Population movement Resistance to antibiotics Changes in food technology Agents of bioterrorism Emerging Infections

15. Lesson 3 1.Jaundice 2. Influenza 3.The common cold 4. Pneumonia Q. ______ can be a complication of the flu. Choose the appropriate option. Quick Review

16. Lesson 3 A. 4. pneumonia Pneumonia can be a complication of the flu. Click Next to attempt another question. Quick Review - Answer

17. Lesson 3 Quick Review Q. You can reduce your risk of getting influenza by doing the following. Avoid close contact with infected people. Wash hands often. Keep hands away from eyes and nose. Choose the appropriate option. True False

18. Lesson 3 Click Next to attempt another question. A. True. You can reduce your risk of getting influenza by doing the following. Avoid close contact with infected people. Wash hands often. Keep hands away from eyes and nose. Quick Review - Answer

19. Lesson 3 Quick Review Q. Emerging infections are communicable diseases whose incidence in humans has decreased within the past two decades but threatens to increase in the near future. Choose the appropriate option. True False

20. Lesson 3 A. False. Emerging infections are communicable diseases whose incidence in humans has increased within the past two decades and threatens to increase in the near future. Quick Review - Answer

21. Lesson 3 End of lesson 3 Click Home to view the Main menu.

22. Lesson 3 Types of Hepatitis Hepatitis is inflammation of the liver. It can be caused by drug or alcohol use and by many different pathogens. The hepatitis B virus (HBV) is found in most bodily fluids of an infected person, especially blood. Hepatitis B virus frequently causes severe liver damage. Reduce your risk of hepatitis B by abstaining from sexual contact and from illegal drug use. Hepatitis A Hepatitis B Hepatitis C Hepatitis

23. Lesson 3 Types of Hepatitis Hepatitis is inflammation of the liver. It can be caused by drug or alcohol use and by many different pathogens. The hepatitis C virus is most often transmitted by infected blood through contaminated needles shared by drug users. Hepatitis C can lead to chronic liver disease, liver cancer, and liver failure. Reduce your risk of hepatitis C by abstaining from illegal drug use. Hepatitis A Hepatitis B Hepatitis C Hepatitis

24. Lesson 3 Pneumonia Viral pneumonia is relatively short-lived and produces symptoms similar to those of influenza. Antiviral drugs are used in some cases. Bacterial pneumonia can be treated with antibiotics if diagnosed early. The bacteria that cause pneumonia are often present in healthy throats. When body defenses are weakened in some way, the bacteria can get into the lungs and multiply. Pneumonia is an inflammation of the lungs commonly caused by bacterial or viral infection. Respiratory Infections

25. Lesson 3 Types of Hepatitis Hepatitis is inflammation of the liver. It can be caused by drug or alcohol use and by many different pathogens. Hepatitis A Hepatitis B Hepatitis C The hepatitis A virus is most commonly spread through contact with the feces of an infected person. Symptoms of hepatitis A may include fever, nausea, vomiting, fatigue, abdominal pain, and jaundice.jaundice Practice careful handwashing and avoid close contact with people who are infected. Jaundice is a yellowing of the skin and eyes. Hepatitis

26. Lesson 3 Many factors are contributing to the development of emerging infectionsemerging infections. Some of these factors include the following: Transport across borders Population movement Resistance to antibiotics Changes in food technology Agents of bioterrorism Contributing Factors An emerging infection is a communicable disease whose incidence in humans has increased within the past two decades or threatens to increase in the near future. Emerging Infections

27. Lesson 3 A. Correct! Pneumonia can be a complication of the flu. Click Next to attempt another question. Quick Review - Answer

28. Lesson 3 You have answered the question incorrectly. Go back to try again, or click Next to view the correct answer. Quick Review - Answer

29. Lesson 3 A. Correct! You can reduce your risk of getting influenza by doing the following. Avoid close contact with infected people. Wash hands often. Keep hands away from eyes and nose. Click Next to attempt another question. Quick Review - Answer

30. Lesson 3 You have answered the question incorrectly. Go back to try again, or click Next to view the correct answer. Quick Review - Answer

31. Lesson 3 A. Correct! Emerging infections are communicable diseases whose incidence in humans has increased within the past two decades or threatens to increase in the near future. Quick Review - Answer

32. Lesson 3 You have answered the question incorrectly. Go back to try again, or click Next to view the correct answer. Quick Review - Answer