International Health Partnership

There are still some things that we know about HIV and AIDS.

For example, do not really know why it is that HIV and AIDS are both so common in some African countries but not in Europe or America, although we do have some theories.

Factors that may contribute include the much higher prevalence of sexually transmitted diseases not covered in Africa (which usually increases the likelihood of HIV transmission) and, quite possibly, differences in HIV subtypes.

Also, people who have a poorer general health (including those with malaria or tuberculosis) are more likely to have higher amounts of HIV in their body fluids, making them more likely to transmit the virus.

The concentration of an infectious disease in particular groups is not unusual. Hepatitis B is transmitted by many of the same ways that HIV and in Western countries has the same risk groups.

Hepatitis C (which is mainly transmitted via blood) is mainly confined to intravenous drug users, and the recent increases in syphilis cases (which is usually transmitted through sexual contact) have been spurred by outbreaks in groups of men who have sex with men.

Surveillance statistics from all across the Western world show that AIDS is becoming increasingly common outside the traditional risk groups, following similar trends in HIV cases.

In 2003, about a third of AIDS cases diagnosed in the United States, and two thirds of those in women occurred among persons not using drugs.138 heterosexual Epidemiological evidence for sexual transmission of HIV from male to female , man to man

.Another thing that is not fully understand how HIV causes AIDS. Again, however, we have some theories explain how the virus can cause the immune system to stop functioning properly in many ways and not only directly kill cells.

140 Ignorance about the precise way in which something happens is not evidence that does not happen.

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