'The vaccine made use of a modified virus — called adenovirus 5 (Ad5) — as a vector to transport some of HIV’s genetic material into the body.'
'Exactly how the vaccine increased the risks of HIV transmission is unknown, but a conference convened by the National Institutes of Health recommended against further use of Ad5 as a vector in HIV vaccines (Dr. Anthony Fauci was lead author of the paper (https://science.sciencemag.org/content/344/6179/49) outlining this position.)
Ad5 is used as a vector in some Covid-19 vaccines — Science identifies (https://www.sciencemag.org/news/2020/10/could-certain-covid-19-vaccines-leave-people-more-vulnerable-aids-virus) four such candidates that are currently undergoing clinical trials in various countries around the world, including the U.S., with two in large scale phase 3 trials ongoing in Russia and Pakistan.'
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