A study of the origins of HIV has been linked to chimpanzees

Human immunodeficiency virus (HIV), also known as AIDS, is a virus that causes the deficiency of the human immune system.
In 1981, the human immunodeficiency virus was first identified in Central America.
This is a lentivirus that infects cells of the human immune system. It is a type of retrovirus.
On October 27, 2017, the list of carcinogens released by the international agency for research on cancer of the world health organization (who) was preliminarily sorted out for reference, and human immunodeficiency virus type I (infection) was listed in category 1 carcinogens, while human immunodeficiency virus type 2 (infection) was listed in category 2B carcinogens.
The nearly complete HIV genome, the oldest known, was recently discovered from tissue samples preserved in 1966.
The sample was from the democratic republic of Congo, and the oldest known HIV genome was from a blood sample taken from Congo in 1976.
Tracing the genetic sequence helps us find and determine the timing of mutations in the virus’s genes, thus helping scientists track the spread of the virus and determine when it reached humans.
Based on the genetic sequences of the latest virus samples, HIV may have first spread from chimpanzees to humans in central Africa sometime in the early 1900s.
There are many strains of the virus. There are four known HIV strains, M, N, O and P, each with a different source.
The most widespread of these, M and N, had long been confirmed to be from chimpanzees, but the rarer ones, O and P, both from gorillas in southwestern Cameroon, were later confirmed.
There have been only two cases of type P and only 100,000 cases of type O worldwide, mainly in west and central Africa.
The M group of hiv-1 viruses accounted for 95% of the total.

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