HIV crossed from chimps to humans in the 1920's in what is now the Democratic Republic of Congo. This was probably as a result of chimps carrying the Simian Immunodeficiency Virus (SIV), a virus closely related to HIV, being hunted and eaten by people living in the area.
Ice. Use ice to numb the pain and reduce swelling. Wrap the ice in a towel so it doesn’t touch the skin directly.
Homeicide would be your answer sorry if I am wrong