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rfmcdonaldVarious studies over the past decade have demonstrated that genes responsible for helping some people--northern Europeans, mainly--resist the progression of HIV/AIDS and save others from infection entirely thanks to the selective effects of an infectious disease. Some have suggested that the disease was the Black Death of the 14th century, but others suggest that probably more likely a disease endemic for centuries like smallpox. This last hypothesis makes this news item believable to this layman.
As commenters note, correlation isn't causation. Leaving aside the multiple other factors responsible for the HIV/AIDS pandemic, like the mass movement of people across countries and continents, the effects of smallpox vaccinations are said to fade over a decade; assuming that people were vaccinated as children, by the time they became sexually active the vaccine's effects would have wore off. Still, it's an interesting correlation.
With smallpox largely eradicated around the world, health organizations phased out the smallpox vaccine between the 1950s and 1970s (the last natural case of the disease was seen in 1977, in Somalia). During that span, Raymond Weinstein says, the AIDS crisis broke out in force. And in a study in BMC Immunology, he argues those two events could be connected.
Supposing that smallpox vaccination could have some effect on a person’s susceptibility to HIV, researchers led by Weinstein tested the idea on cells in a lab. They took immune cells from 10 people recently vaccinated against smallpox and 10 people never vaccinated. HIV, they found, was five times less successful at replicating with the cells of vaccinated people.
Why?The researchers believe vaccination may offer some protection against HIV by producing long-term alterations in the immune system, possibly including the expression of a receptor called CCR5 on the surface of white blood cells, which is exploited by the smallpox virus and HIV [BBC News].
Any finding that expands knowledge of how HIV replicates could be an important one. And while this small study can’t prove Weinstein’s assertion is correct, the argument is, at the very least, plausible.
As commenters note, correlation isn't causation. Leaving aside the multiple other factors responsible for the HIV/AIDS pandemic, like the mass movement of people across countries and continents, the effects of smallpox vaccinations are said to fade over a decade; assuming that people were vaccinated as children, by the time they became sexually active the vaccine's effects would have wore off. Still, it's an interesting correlation.
