论文部分内容阅读
AIDS, acquired immune deficiency syndrome, first reported in the United States in 1981, is a deadly disease that is caused by a virus Because intimate sexual contact is the most common way of transmitting the virus, all sexually active Americans need to avoid the risk of infection. The AIDS virus damages the body’s ’natural immune defenses against disease’. People with AIDS develop life-threatening illnesses that do not affect per
AIDS, acquired immune deficiency syndrome, first reported in the United States in 1981, is a deadly disease that is caused by a virus Because intimate sexual contact is the most common way of transmitting the virus, all sexually active Americans need to avoid the risk of infection. The AIDS virus damages the body’s ’natural immune defenses against disease’. People with AIDS develop life-threatening illnesses that do not affect per