HIV/AIDS: HIV is a sexually transmitted virus and AIDS is the life-threatening immune failure that occurs late in the progression of HIV. AIDS was once in the top ten cause of death in the USA but has dropped out owing to better treatments and reduced transmission.
Very early stages of HIV just after infection resemble the flu or another viral infection. There then follows a latent stage (often years) with no symptoms, and then an early AIDS stage (also often years) with various symptoms, many of them non-specific and easy to misdiagnose. AIDS becomes much more characteristic in the latter stages of the disease where immune failure becomes almost total. .
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