Harmless Virus May Blunt Deadly Effect of HIV
People Infected With Secondary Virus May Live Longer With HIV
March 3, 2004 -- An apparently harmless virus may allow some men with HIV to live longer, healthier lives. But researchers say those benefits only emerge after many years of being infected with both viruses.
A new study found men infected with both HIV and GB virus type C (GBV-C), previously known as hepatitis G, for at least five years were three times less likely to die than HIV-positive men who did not have GBV-C.
GBV-C is a virus that infects white blood cells, but is not known to cause any disease in humans. People with the virus can carry it for up to 40 years, and the virus is transmitted through blood and blood products.
Researchers say six previous studies have also found a survival advantage for HIV-positive men who had GBV-C, but three others showed no benefit, and the relationship between the two viruses is controversial.
But researchers say this new study, published in the March 4 issue of the New England Journal of Medicine, is the first to take into account the duration of infection with GBV-C and its effect on the progression of HIV disease.
"We found strong evidence that HIV-positive men who have persistent GBV-C infection survive longer than those who do not have GBV-C," says researcher Jack Stapleton, MD, of the University of Iowa, in a news release. "The survival advantage is large and depends on how long the GBV-C infection persists."
2 Viruses Better Than 1 for HIV Survival?
In the study, researchers compared two separate sets of blood samples taken from men who were infected with HIV. The first set consisted of 271 samples that were taken within 18 months of when the patient was infected with HIV. The second set of 138 samples was drawn from the men five to six years later.
The study showed that men who had GBV-C infection in both sets of samples taken at least five years apart lived the longest. Eleven years after contracting HIV, 75% of the men who had GBV-C in both samples were alive compared with only 39% of the men who did not have GBV-C in either sample.