NYC mayor: Legionnaires' outbreak has claimed 12 lives

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What You Need to Know About Legionnaires' Disease

NEW YORK (AP) — New York City Mayor Bill de Blasio says 12 people have now died from a Legionnaires' disease outbreak.

De Blasio said Monday that cases now total 113. That number went up slightly because people were diagnosed after the fact. There have been no new cases in the last week, and authorities say there's no sign of anyone else getting sick.

The outbreak is the largest in city history. It is centered in the South Bronx, where 12 buildings have tested positive for the bacteria.

The disease is a form of pneumonia. It's caused by breathing in mist contaminated with the Legionella bacteria.

It's especially dangerous for the elderly and for people with underlying health issues.

It's not clear what triggered the outbreak, which began last month.

Photos from the outbreak in N.Y.C.:

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Legionnaires in NYC
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NYC mayor: Legionnaires' outbreak has claimed 12 lives
NEW YORK, NY - AUGUST 13: The Opera House Hotel at 436 East 149th Street, which houses a water cooling tower that was found to have traces of legionella pneumophila bacteria, which may have helped cause the recent outbreak of Legionnaires' disease in the Bronx, is seen on August 13, 2015 in the Bronx borough of New York City. In a press conference today New York City Mayor Bill de Blasio said that while new cases of Legionnaires' may appear, the outbreak has been contained and that the water cooling towers the New York City Department of Health believe are responsible for the outbreak have been decontaminated. (Photo by Andrew Burton/Getty Images)
Marvin Montgomery, a Legionnaires disease patient at Harlem Hospital on Thursday, August 6, 2015 in New Yrok, N.Y. Montgomery worked near Lincoln Hospital, one of five sites that tested positive for the bacteria, and frequently used the hospital bathroom. City officials released new numbers Thursday showing the death toll since July 12 was now in the double digits while overall cases had climbed to 100. All the people affected are from the South Bronx. (Photo By: James Keivom/NY Daily News via Getty Images)
NEW YORK, NY - AUGUST 06: The Opera House Hotel is viewed in an area of the Bronx which is the center of the outbreak Legionnaires disease on August 6, 2015 in New York City. It is believed that cooling towers in the area contributed to the illness which is believed to be contracted by inhaling mists from contaminated bacteria in the water source. The Bronx, and specifically the area around the Opera Hotel on East 149th Street, is in the middle of the largest outbreak of Legionnaires disease in New York City's history. New York authorities announced that as of Wednesday night the illness has now sickened nearly 100 people since July 10, with at least eight people having died. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - AUGUST 06: A man looks in the window of a building for a person who lost a relative to Legionnaires disease in an area of the Bronx which is the center of the outbreak on August 6, 2015 in New York City. It is believed that cooling towers in the area contributed to the illness which is believed to be contracted by inhaling mists from contaminated bacteria in the water source. The Bronx, and specifically the area around the Opera Hotel on East 149th Street, is in the middle of the largest outbreak of Legionnaires disease in New York City's history. New York authorities announced that as of Wednesday night the illness has now sickened nearly 100 people since July 10, with at least eight people having died. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - AUGUST 06: People walk in an area of the Bronx which is the center of the outbreak Legionnaires disease on August 6, 2015 in New York City. It is believed that cooling towers in the area contributed to the illness which is believed to be contracted by inhaling mists from contaminated bacteria in the water source. The Bronx, and specifically the area around the Opera Hotel on East 149th Street, is in the middle of the largest outbreak of Legionnaires disease in New York City's history. New York authorities announced that as of Wednesday night the illness has now sickened nearly 100 people since July 10, with at least eight people having died. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - AUGUST 06: Lydia Ramirez, the wife of Carmelo Quiles who recently died of Legionnaires disease, pauses in her apartment in an area of the Bronx which is the center of the outbreak on August 6, 2015 in New York City. It is believed that cooling towers in the area contributed to the illness which is believed to be contracted by inhaling mists from contaminated bacteria in the water source. The Bronx, and specifically the area around the Opera Hotel on East 149th Street, is in the middle of the largest outbreak of Legionnaires disease in New York City's history. New York authorities announced that as of Wednesday night the illness has now sickened nearly 100 people since July 10, with at least eight people having died. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - AUGUST 06: People walk past the Opera House Hotel in an area of the Bronx which is the center of the outbreak Legionnaires disease on August 6, 2015 in New York City. It is believed that cooling towers in the area contributed to the illness which is believed to be contracted by inhaling mists from contaminated bacteria in the water source. The Bronx, and specifically the area around the Opera Hotel on East 149th Street, is in the middle of the largest outbreak of Legionnaires disease in New York City's history. New York authorities announced that as of Wednesday night the illness has now sickened nearly 100 people since July 10, with at least eight people having died. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - AUGUST 06: People walk in an area of the Bronx which is the center of the outbreak Legionnaires disease on August 6, 2015 in New York City. It is believed that cooling towers in the area contributed to the illness which is believed to be contracted by inhaling mists from contaminated bacteria in the water source. The Bronx, and specifically the area around the Opera Hotel on East 149th Street, is in the middle of the largest outbreak of Legionnaires disease in New York City's history. New York authorities announced that as of Wednesday night the illness has now sickened nearly 100 people since July 10, with at least eight people having died. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - AUGUST 06: The Opera House Hotel is viewed in an area of the Bronx which is the center of the outbreak Legionnaires disease on August 6, 2015 in New York City. It is believed that cooling towers in the area contributed to the illness which is believed to be contracted by inhaling mists from contaminated bacteria in the water source. The Bronx, and specifically the area around the Opera Hotel on East 149th Street, is in the middle of the largest outbreak of Legionnaires disease in New York City's history. New York authorities announced that as of Wednesday night the illness has now sickened nearly 100 people since July 10, with at least eight people having died. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - AUGUST 06: Carmen Ramirez, whose father Carmelo Quiles recently died of Legionnaires disease, pauses in her mothers apartment with a picture of her father in an area of the Bronx which is the center of the outbreak on August 6, 2015 in New York City. It is believed that cooling towers in the area contributed to the illness which is believed to be contracted by inhaling mists from contaminated bacteria in the water source. The Bronx, and specifically the area around the Opera Hotel on East 149th Street, is in the middle of the largest outbreak of Legionnaires disease in New York City's history. New York authorities announced that as of Wednesday night the illness has now sickened nearly 100 people since July 10, with at least eight people having died. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - AUGUST 06: Carmen Ramirez, whose father Carmelo Quiles recently died of Legionnaires disease, pauses in her mothers apartment in an area of the Bronx which is the center of the outbreak on August 6, 2015 in New York City. It is believed that cooling towers in the area contributed to the illness which is believed to be contracted by inhaling mists from contaminated bacteria in the water source. The Bronx, and specifically the area around the Opera Hotel on East 149th Street, is in the middle of the largest outbreak of Legionnaires disease in New York City's history. New York authorities announced that as of Wednesday night the illness has now sickened nearly 100 people since July 10, with at least eight people having died. (Photo by Spencer Platt/Getty Images)
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