Glencoe Health 2005.pdf

Jaundice 638 chapter 24 communicable diseases about

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jaundice 638 Chapter 24 Communicable Diseases About 30 to 40 percent of people with hepatitis B don’t know how they got the infection. How can you protect yourself from exposure to hepatitis B?
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Other Diseases everal other communicable diseases are common among ado- S lescents and young adults. Figure 24.5 on page 640 provides a summary of these diseases. Emerging Infections ome diseases have been effectively controlled with the help of S 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 Moderate risk Low risk Minimal or no risk High risk What does the concentration of cases here tell you about the environment in which ticks live? What is different about this part of the country that could account for the lower incidence of Lyme disease? What human activities (leisure and industrial) could have influenced the increase in cases from 1982 to the present? Work with a small group of students. Together, analyze the graph and discuss the questions. Use what you’ve learned to develop an action plan to decrease your risk of contracting Lyme disease. Include specific steps to protect yourself. Consider clothing, insect repellents, where you live or travel, and the time of year. A C T I V I T Y Reducing Your Risk of Lyme Disease In 1982 fewer than 1,000 cases of Lyme disease were reported in the United States. Today, more than 16,000 cases are reported each year. Lyme disease is transmitted to humans by the bite of an infected deer tick. Ticks favor a moist, shaded environment, such as forests. Coastal ticks thrive in areas of high rainfall. Ticks are most active in the spring and summer. Study the graph to help you analyze the environmental and geographical factors that influence the distribution and rate of disease in the United States. Use this information to develop a plan to reduce your risk. 639 Lesson 3 Common Communicable Diseases HS_HEALTH_U08_C24_L3 12/8/03 5:29 PM Page 639
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640 Chapter 24 Communicable Diseases that are resistant to drug treatments. These diseases are known as “emerging” diseases. 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. Many factors are contributing to the development of emerging infections: Transport across borders. Infected people and animals carry pathogens from region to region, often to places where those pathogens previously were not a problem. Two examples of this are the appearance of dengue fever and West Nile encephalitis, which is caused by West Nile virus. Dengue fever is found mostly in South and Central America and parts of Asia and has appeared in the southwestern United States. West Nile encephalitis appears in Asia, Africa, and Europe and is now expanding across the Western Hemisphere, including parts of the United States. Both diseases are carried by mosquitoes.
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