Friday, September 4, 2009

How does hiv aids happens to first person

How does hiv aids happens to first person?
i know that aids can spread from infected person to normal person but i want to know how it happens to first person
STDs - 3 Answers
Random Answers, Critics, Comments, Opinions :
1 :
If you mean "how did the first ever person catch AIDS" - we don't really know. It is thought that it may have come from being contaminated with the blood of "jungle meat" such as chimpanzees and large apes. Another theory is that it was actually created in a vaccine which was produced in chimpanzees and was tested on gay men and African men.
2 :
Firstly, AIDS does not spread. HIV spreads. AIDS, defined as having a CD4 count below 200 or an opportunistic infection, is a RESULT of HIV. The virus originated in Africa. Hunting for monkeys is violent, and exposes both the monkey and the human to blood (the blood of the hunted monkey entered accidental cuts of the hunter).
3 :
First person got HIV from primate infected with SIV (simian immunodeficiency virus). By accident and because primates are very close to humans physiologically, the virus was able to establish infection in the person despite of being primate-specific. This is the first step! Probably the person later developed AIDS. Second step involves viral mutation that allows the virus to transmit from person to person and establish infection in all subsequently infected individuals. According to molecular evidence HIV crossed primate-human barrier in early 20th century. When pandemic was detected - all initially infected persons were likely to be dead and nobody knows who they were. Three hypotheses of global pandemic exist: 1.The virus was transmitted to humans in the 1800s or early 1900s. It then would have remained isolated in a small, local human population until about 1930s, when it began spreading to other human populations and to diversify (Transmission Early Hypothesis). 2.The virus was transmitted from chimpanzees to humans around 1930, and immediately began to spread and diversify in human populations (Transmission Causes Epidemic Hypothesis). 3.Multiple strains of SIV were transmitted from chimpanzees to humans in the 1940s or 1950s (Parallel Late Transmisson Hypothesis).

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