PHILADELPHIA (CBS) – The data is scary: Nearly half of water faucets sampled across the United States tested positive for the bacteria that causes Legionnaires’ disease.

While the study was small — researchers only sampled 67 public and private water sources such as kitchen sinks and drinking fountains – it’s the first one to chart the presence of the potentially deadly bacteria in water taps.

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According to the EPA, the organization that conducted the research, 32 taps contained the bacteria, and 11 of those contained it in multiple samples.

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Legionnaires’ disease is a severe form of pneumonia that causes chills, fever, headache, a cough and more. It can be deadly.

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The study was published on Feb. 18 in the journal Environmental Science & Technology.