It's 30 years since the first cases of HIV infection. During this time, says the website HIVaware, we've seen rapid change.
Scientists inserted two genes into cats: the first is taken from macaque monkeys and helps the cat resist the feline form of Aids; the second is a fluorescent gene from jellyfish that helps the researchers literally see where the added anti-aids gene is active.
A vaccine has been developed that protects monkeys from Simian Immunodeficiency Virus (SIV), the monkey equivalent of HIV.
Scientists have discovered that the natural hosts of a strain of SIV develop AIDS when infected.
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