Did the End of Smallpox Vaccination Cause the Explosive Spread of HIV?

[The Straight Story]

Did the End of Smallpox Vaccination Cause the Explosive Spread of HIV?

ScienceDaily (May 17, 2010) — Vaccinia immunization, as given to prevent the spread of smallpox, produces a five-fold reduction in HIV replication in the laboratory. Researchers writing in the open access journal BMC Immunology suggest that the end of smallpox vaccination in the mid-20th century may have caused a loss of protection that contributed to the rapid contemporary spread of HIV

Raymond Weinstein, a family doctor turned laboratory scientist at George Mason University, Manassas, Virginia, worked with a team of researchers from George Washington University and UCLA. The researchers looked at the ability of white blood cells taken from people recently immunized with vaccinia to support HIV replication compared to unvaccinated controls. They found significantly lower viral replication in blood cells from vaccinated individuals.

Weinstein said, "There have been several proposed explanations for the rapid spread of HIV in Africa, including wars, the reuse of unsterilized needles and the contamination of early batches of polio vaccine. However, all of these have been either disproved or do not sufficiently explain the behavior of the HIV pandemic. Our finding that prior immunization with vaccinia virus may provide an individual with some degree of protection to subsequent HIV infection suggests that the withdrawal of such vaccination may be a partial explanation."

Smallpox immunization was gradually withdrawn from the 1950s to the 1970s following the worldwide eradication of the disease, and HIV has been spreading exponentially since approximately the same time period. Weinstein and his colleagues propose that vaccination may confer protection against HIV by producing long term alterations in the immune system, possibly including the expression of a certain receptor, CCR5, on the surface of a person's white blood cells which is exploited by both viruses.

http://www.sciencedaily.com/releases/2010/05/100517204405.htm

[Adsos Letter]

1. Interesting. So this vaccination factor

could have been the one which allowed other factors mentioned in the article (War, lack of prophylaxis, etc.) to function significantly?