New York City rats are big, ugly, and now apparently deadly. 

City health authorities are investigating three cases of poisoning by rat urine, one of them fatal, the New York Times reports. The victims of leptospirosis were all in the Bronx, the first such cluster of the rare disease reported in a city infamous for its robust rodents. The health department issued an alert on Tuesday following the death of a man in his 30s.

Two of the bacterial infections occurred in December and one this month, per ABC7. All three people were hospitalized with acute kidney and liver failure, and two have recovered and been released. In the past 10 years, leptospirosis has sickened 26 people in the city, eight of them in the Bronx.

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