AIDS Virus Now Estimated To Be 100 Years Old

ChazeFroy writes "A new study estimates that the AIDS virus, HIV, started to circulate in the human population between 1884 and 1924, with a more focused estimate at 1908. This is much earlier than the previously-held estimate of 1930. 'The new result is "not a monumental shift, but it means the virus was circulating under our radar even longer than we knew," says Michael Worobey of the University of Arizona, an author of the new work.' The article also speculates that HIV first began to spread in Kinshasa, Congo."

Comments

What new diseases have crossed over recently?

[davidwr]

It took over 70 years for HIV to be named.

What diseases that crossed the species barrier in the last 30 years will we be talking about in 2078?

Re:What new diseases have crossed over recently?

[hey!]

Probably quite a few.

One of the big killers in worldwide mortality statistics (after HIV and malaria) is, if I recall, "acute respiratory infection", which includes just about anything that didn't get an official diagnosis other than the obvious fact the person died of some kind of lung infection. That probably contains countless infectious agents as yet unknown to science.

Infectious agents often develop a kind of symbiotic relationship with their host populations. They are tolerated by the populations, but they are deadly to immunologically naive populations. Move into to take over another population's niche, and you must endure ordeal by disease.

Emerging diseases will be a major story throughout this century, mark my words. As people move into previously "pestilential" habitats, as climate change disrupts and displaces populations, we'll be seeing a lot more the likes of HIV, bird flu, and Ebola (which is probably the least dangerous of the three in a public health sense).

Now is the time for a new Apollo program, but in the biological sciences. Now is the time to pick a family of viruses, like influenza, and learn to attack it, not just by public health and immunization measures, but directly through its genetic, biochemical and biological characteristics. This would not only be of great practical benefit, it would prepare us for new agents, or new strains of old infectious agents.

Re:What new diseases have crossed over recently?

[reverseengineer]

Modern transportation networks, industrialized agriculture/animal husbandry, and globalization all make it less likely that a zoonotic disease will be able to remain contained in a small population for the length of time HIV managed. The construction of road networks deep into the rainforests of the Congo (sometimes described as "the AIDS Highway") connected a huge biological reservoir with the wider world, and the construction of the international air travel network eliminated many of the natural geographic barriers to the spread of disease. It is of note that that Ebola and Marburg both found their way out of the jungle at about the same time as HIV; Marburg is naturally endemic to central Africa, but gets its name from an outbreak in Germany.

As development continues into the high-biodiversity tropics, we will continue to be confronted by new diseases. What will disappear is endemism, where a disease can percolate among a small reservoir for decades before breaking out into the wider world. AIDS is thought to have trickled through a network of truck drivers and prostitutes across central Africa, until it finally made it to people who hopped on planes and spread it to Europe and North America. Now, someone can pick up a disease in a jungle (or a livestock processing plant) and bring it to New York, London, or Shanghai the next morning. On the other hand, reporting and containment of outbreaks has become faster- in large part from painful lessons learned from the spread of AIDS.

To more precisely answer the parent's question though-"What diseases that crossed the species barrier in the last 30 years will we be talking about in 2078?"- my guess is we'll still be dealing with foodborne microorganisms, especially the pathogenic E. coli strains, with the expectation that one of those will pop up with a nasty new enterohemorrhagic strain in the vein of E. coli O157:H7. I think we'll still be talking about prion diseases given their relation to the food supply as well. Their first recorded human cases are earlier than 30 years ago, but I'd argue for the emerging future importance of West Nile virus and dengue fever as the types of mosquitoes that spread them have greatly increased their ranges. Probably some sort of viral respiratory ailment (like SARS)- they just spread so easily.

Factoid about E. coli: the O157:H7 strain, the one which causes the most serious human illness, is nothing new. It is estimated to have picked up its nasty shigatoxin (distinguishing it from the more benign strains) between 2 and 4 million years ago. The first recorded outbreak in humans, however, occurred in 1982.

Re:Wait, what?

[mcgrew]

I'm skeptical. How could a disease with such a long incubation period not be recognized for over a century? It's not like needles or anal sex were invented in 1965. And then in a period of a few years become a worldwide epidemic? Yeah, I RTFA but I'm not buying the "city" hypothesis; it's not like people in the country don't have anal sex.

Two notes though, the first serious and the second humorous (humoroidous).

When I was in Thailand in the USAF from Aug. 1973 to Aug 1974, there were rumors of a sexually transmitted disease that was being hushed up by the government. The rumor had it that this disease was fatal and had no cure, and if you caught it you would be transferred to Guam and never heard from again. Most of us dismissed these rumors as government propaganda to keep us away from the whores or at least to get us to use condoms (penicillin isn't free) but when AIDS came around in 1981 (killing "free sex" and having women not come up to you asking you "wanna fuck?", damned AIDS!) I started to wonder if the rumor might have been true.

Secondly, a wag I worked with when AIDS started in 1981 said AIDS was an acronym for "Anal Intercourse Death Syndrome". It really isn't an STD but a blood-borne disease, more easily transmitted by blood transfusions, dirty needles, and sex that tears into the flesh. It's damned hard for a man to catch it having sex with a woman unless the sex is anal or while she's on her period, particularly if he's been circumcised.

Re:Wait, what?

[Anonymous Coward]

I'm skeptical. How could a disease with such a long incubation period not be recognized for over a century? It's not like needles or anal sex were invented in 1965. And then in a period of a few years become a worldwide epidemic? Yeah, I RTFA but I'm not buying the "city" hypothesis; it's not like people in the country don't have anal sex.

It was an order of magnitude difference. Many of the sexual histories of the initial cases in San Francisco had hundreds of sexual contacts per year. Typical bathhouse sexual encounters numbered over 5 per night per person. One case history example is that Gaëtan Dugas claimed to have had 2500 sexual encounters in his life. These types of numbers don't occur in the country. Additionally, country sex is less anonymous and more often with the same partner. Most of the bathhouse encounters were with different people.

Re:Maybe Duesberg was right

[khallow]

I disagree. There were significant changes in the 60's that you aren't getting. First, airline travel was more widespread in the 60's. Second, there were people having unprotected sex with dozens or hundreds of partners. Sure that was going on in the 50's, but by the 70's there was a lot more possibilities for HIV infection to propagate. Finally, heroin use grew dramatically as the Vietnam War dragged on, providing a more reliable means for HIV infection via used needles.