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. Last Updated: 07/27/2016

4 Men Die of Legionnaires'

Four men have died and 150 people hospitalized in the Sverdlovsk region in an outbreak of Legionnaires' disease spread by tap water, NTV television reported Wednesday.

An elderly man died early Wednesday in the town of Verkhnyaya Pyshma, becoming the fourth victim of pneumonia caused by legionella bacteria, NTV said.

Since July 20, at least 131 people have been diagnosed with the disease in the Ural Mountains region. Dozens of others have been hospitalized in the area with less dangerous forms of pneumonia as a precaution, the report said.

Legionnaires' disease is a form of pneumonia named after a deadly outbreak of the disease at an American Legion convention in Philadelphia in 1976. Most people infected with the bacteria never get sick, but elderly people and those with weak immune systems can be susceptible. The disease is treatable with antibiotics.