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— (HealthDay News) Even with long-term treatment, HIV can still be found in the cerebrospinal fluid of some people with the AIDS-causing virus, a new study reports. And these patients are at increased risk of having thinking problems, the researchers say. “It is difficult to target infections that lurk in the brain, and HIV is probably not an exception to the rule,” said study senior author Dr. John Mellors, chief of infectious diseases at the University of Pittsburgh. “We have our work cut out for us in the quest for an HIV cure, but knowing is half the battle, so I’m cautiously optimistic,” he said in a university news release. Researchers analyzed cerebrospinal fluid from 69 people with HIV who had been on anti-HIV therapy for an average of nine years. The study found that nearly half the participants had cells harboring HIV. Of those who had HIV-harboring cells in their cerebrospinal fluid, 30% met criteria for thinking problems (cognitive impairment), compared with 11% of those without HIV-harboring cells in their cerebrospinal fluid. The findings may help explain why people with well-controlled HIV can have memory and concentration problems and difficulty completing complex tasks, according to the researchers. They also said that the results show that the brain is an important reservoir for HIV, a challenge that needs to be considered in clinical trials of… read on >