Where did STD's come from?!
Question:
Where did STD's come from?
If two people do NOT have any STD, then they can't pass any to eachother. But there was a starting point, where did they come from, how did they start?
Answers:
Viruses and bacteria evolve, the same as people and other animals evolve. All living things have evolved from simple single cells. Some organisms such as bacteria have stayed simple. Viruses are so simple they ar not even a cell, and are not usually thought of as "alive".
Sex is nature's way of getting fragile genetic material from one animal to another. STIs are bugs that have evolved to take advantage of that mechanism of getting from body to body. Some sexually transmissible bugs such as HIV, hepatitis B and syphilis can also pass from body to body by blood to blood or from mother to baby during or close to birth.
When a bug appears suddenly in the human population it may be because it has been evolving in another animal but has changed so that it can easily infect and cause disease in humans. This is the case with HIV1 and HIV2, and is also the case with many other viruses such as the influenza viruses.
HIV1 originally evolved from a common virus in certain chimpanzees called SIV. It changed to a form that can infect humans, and then made the species jump, probably in the 1930s and possibly to a human hunter who was butchering a chimp infected with this new virus.