AP11081819071City health officials are warning New Yorkers about an increase in cases of Legionnaire’s disease, a potentially deadly form of pneumonia, in the Bronx.¬†Eleven cases of the disease were reported in the Bronx in December, compared with two in December 2013 and three in December 2012. The 11 cases reported last month represent nearly 20 percent of the total of 61 cases the borough had in all of 2014. Most cases were in the northeast Bronx. ¬†Legionnaire’s disease is caused by exposure to the bacteria Legionella, an aquatic organism that grow in warm environments. People are exposed to it by inhaling contaminated aerosols from cooling towers, whirlpool spas, showers and faucets or drinking water contaminated with the bacteria. More