News Legionnaires' has sickened 108 in NYC, but outbreak appears to be ebbing, officials say Legionnaires' disease is a severe form of pneumonia caused by a type of bacteria called Legionella, according to the CDC. This colorized scanning electron micrograph with moderately-high magnification depicts a large grouping of Gram-negative Legionella pneumophila bacteria. Photo Credit: Wikimedia Commons / CDC By MATTHEW CHAYES firstname.lastname@example.org @chayesmatthew August 8, 2015 5:44 PM Print Share fbShare Tweet gShare Email The worst Legionnaires' disease outbreak in New York City has now sickened 108 people in the South Bronx, though no new cases have been diagnosed in recent days, health officials said Saturday in announcing that the flare-up appears to be flaming out. The previous tally, reported by the city earlier this week, had been 101. So far, 10 people have died of Legionnaires', a treatable bacteria pneumonia, and all are older adults with pre-existing health problems. Speaking at the city's emergency management headquarters, Mayor Bill de Blasio said epidemiological testing also identified five new buildings, all in the South Bronx, whose cooling towers contained the bacteria -- bringing the total to 10. All had been decontaminated. One or more of those towers, which can spread Legionnaires' through air mists, are suspected of being the source of the outbreak. By MATTHEW CHAYES email@example.com @chayesmatthew Matthew Chayes, a Newsday reporter since 2007, covers New York City Hall. Share on Facebook Share on Twitter Comments Comments section is temporarily on hold. Here’s why.