Timeouts to wash hands and put on hairnets, a simple checklist to ensure that such seemingly obvious precautions are done, and advertising campaigns directed at everyone from the most senior doctors to the poorest of patients have been credited with drastically reducing the number of serious infections at New York City’s public hospitals. Since 2005, central-line bloodstream infections, which stem from bacteria invading a catheter leading to the heart and can often be fatal, have fallen 55 percent in adult intensive care units at the city’s 11 public hospitals, according to statistics released last week. Ventilator-associated pneumonia, caused by bacteria in breathing tubes and which also can be fatal, declined by 78 percent. Before the hospital system began cracking down on them in late 2005, preventable infections were considered part of the collateral damage of advanced lifesaving techniques, such a routine occurrence that few people questioned their prevalence, or the deaths that resulted from them. In fact, there had been a perverse financial upside to hospital-based infections, since they filled beds that might otherwise be empty. But changes in government reimbursements have driven New York’s public hospitals, which serve the city’s poorest patients, to tackle the problem.

A new, viral web site conceived by U.S. college students challenges stereotypes about who might be infected with HIV using a model pioneered by a campaign to raise awareness about Darfur. The site, www.PosorNot.com, was unveiled on Wednesday by mtvU, the Kaiser Family Foundation and POZ Magazine and presents viewers with photos of people of different ages, colors and genders, challenging them to guess whether the person has tested positive for the virus that causes AIDS.

Think you can tell if we have HIV? Some of us are HIV positive and some are negative. All of us want to challenge your assumptions about HIV. Play the game and see if you can tell who is Pos or Not.