Chronology of research
1984: Researchers isolate the human immunodeficiency virus, HIV, causing AIDS.
1985: Genetic similarities to HIV found in the virus affecting monkeys, so researchers call it SIV.
1986: Journalist Edward Hooper reports on the mysterious disease locally called 'slim' affecting people of a village along Lake Victoria in Uganda.
1987: Link between polio vaccination sites in Africa in 1950s and the earliest AIDS cases established by researcher Pascal.
1987: Virologist Preston Marx found that the mangabey blood samples tested SIV positive and the blood samples of some Liberian villagers contained both HIV and SIV genes.
1992: A freelancer Tom Curtis outlines a theory about the origin of AIDS, much on the lines of Pascal. An expert panel does not discount the chance that SIV survived the vaccine tissue culture process.
1995: Evidence shows AIDS is caused by two viruses - HIV-1 related to chimpanzee and mangabeys related to HIV-2.
1999: Drucker and Marx discover the mass-injection campaign in 1960s in Egypt that caused outbreak of hepatitis C, spread through contaminated needles' reuse.
2000: Geneticist Bette Korber reveals that the virus crossed from a chimpanzee to a "founder" human before 1930s and it was transmitted to other humans.
2001: The serial passage theory of Drucker and Marx gets published in The Lancet.
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