In the study 'HIV-1 Co/Superinfection in Intravenous Drug Users,' reported in the July 2 edition of the journal AIDS, researchers concluded that 'Within the [population of cocaine- and heroin-injecting drug users] we show that coinfection is a relatively frequent event and that superinfection is not a rare event.' The researchers also said that since their selection of patients for detection of superinfection in chronically infected patients was based on an unexpected rise in viremia'yet it was discovered that one of the study subjects did not show a viremia increase despite the discovery of a case of superinfection'they could have failed to detect and thus been unable to report on some cases of superinfection that had occurred in the population.
