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HIV Vaccine Strategy Expands Immune Responses
Date:3/15/2010

HIV is an extremely variable virus. One of the most daunting challenges for developing an effective HIV vaccine is designing one that stimulates immune responses that will protect an individual from the highly diverse spectrum of strains of the circulating virus. The mosaic vaccine design uses computational methods developed at Los Alamos to create small sets of highly variable artificial viral proteins. These proteins, in combination, provide nearly optimal coverage of the diverse forms of HIV circulating in the world today.

In one of the two papers, Dr. Dan Barouch of Beth Israel Deaconess Medical Center at Harvard University reported very promising results when HIV mosaic vaccines were embedded in specialized vectors—organisms that transmit pathogens to a host—that were designed in his laboratory specifically to make strong "Killer T cell" responses. Killer T cells enable our immune system to recognize and kill virally infected cells, and they help clear or contain viral infections.

When this vaccine was used to immunize rhesus monkeys against HIV-1,  the most predominant and transmittable type of the virus, the researchers observed up to four-fold improvement in the monkeys' immune response to HIV-1, compared with natural vaccine strains similar to those that have been used in the past. In the other, complementary study, Drs. Norman Letvin and Sampa Santra, also
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SOURCE Los Alamos National Laboratory
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