NEW YORK — Two more people in the Bronx have died of Legionnaires’ disease, bringing the total of fatalities to 12 in the largest outbreak of the disease in New York City history, officials said Monday.

There are now 113 reported cases of Legionnaires’ in the Bronx, and cooling towers in 18 buildings have tested positive for the legionella bacteria, officials said.

While cleaning crews crisscrossed the Bronx, the continued tension between state and city governments threaten to undermine officials’ expressions of confidence that the outbreak is tapering off.

The outbreak has become the city’s most significant public health crisis since last fall’s Ebola scare.

For more than a month, cases of Legionnaires’ – a form of pneumonia especially dangerous for the elderly and for people with underlying health issues – have been reported throughout a section of the South Bronx, the city’s poorest neighborhood.

“We are dealing with a new set of realities we have never experienced that we have never encountered before in this city,” said Mayor Bill de Blasio, adding that the nation’s largest city has had to create “a playbook” on the fly as to how to handle the crisis.

Officials said that all but one of the 12 people who have died had underlying health problems. Because the disease has a 10-day incubation period, there can be a lag in reporting cases, but de Blasio said Monday that city health officials believe there hasn’t been a new diagnosis since Aug. 3.

He and City Council Speaker Melissa Mark-Viverito introduced legislation that mandates inspections of cooling towers, which are rooftop mechanical structures used to cool large buildings. They eject a warm mist that can carry the bacteria.

While de Blasio spoke at an afternoon news conference at City Hall, Gov. Andrew Cuomo was holding his own news conference at his New York City office on the same subject yet delivering different information.

At his event, Cuomo said state teams – who have been inspecting cooling towers in the Bronx the last three days – had discovered the legionella bacteria in three buildings. But unaware of that discovery, de Blasio said the bacteria had only been located in 12 towers, not the updated total of 15.

A Cuomo spokeswoman said later that Dr. Howard Zucker, the state health commissioner, had called his city equivalent, Dr. Mary Bassett, to brief her on the discovery and left a message, because Bassett was already at de Blasio’s news conference. Cuomo was then briefed on the findings, which led to the governor telling the media and public before the mayor.

The city and state health commissioners put out a joint statement later Monday saying that three additional sites tested positive for the bacteria over the weekend, bringing the total to 18.

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