shygye Posted July 11, 2005 Report Share Posted July 11, 2005 Old Hippie said:WOuldn't the use of condoms throw off the results? I mean how could they tell if it was condom usage or the vaccine which was preventing the virus...? Hence, they would then perhapes be encouraging the lack of condom usage, which would increase the risk of other STDs... That is why a control group is used in studies. One group of prostitutes gets the vaccine and one group (the control group) does not. Then you compare the HIV rates of the two groups. Link to comment Share on other sites More sharing options...
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