Microcheck 291

The signs and symptoms of persons with AIDS are mainly due to the opportunistic infections and tumors that complicate HIV disease. HIV is not highly contagious, and the AIDS worldwide epidemic could be stopped by changes in human behavior. Highly active antiretroviral therapy has given miraculous improvement in many patients with AIDS but is unlikely significantly to affect the advance of the AIDS epidemic. The largely silent spread of HIV continues.

■ What is hairy leukoplakia?

■ How would the ability to recognize differing strains of HIV-1 aid in epidemiological studies?

■ If AIDS was present in Africa in the 1950s, why did it not appear in the United States until the 1970s?

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