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Brooke Army Medical Center (BAMC) in San Antonio, Texas has confirmed Legionnaires’ disease in at least two staff members and a third has testing pending during the past week, according to multiple media accounts.

Legionella pneumophila bacteria/CDC
Legionella pneumophila bacteria/CDC

No patients have been affected.

The Commander of Brooke Army Medical Center says 200 employees working in a building next to the military hospital at Fort Sam Houston in San Antonio were moved out of their workspace today.

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“We have completed initial testing of the water systems and all of those tests have come back negative so far,” said Brigadier General Jeff Johnson. “We have no information that anybody else has been exposed or is at risk.”

Legionnaires’ disease is caused by the bacteria Legionella. Symptoms include fever, cough, chills, muscle aches, headache, fatigue, loss of appetite, confusion and diarrhea. Symptoms usually appear two to 10 days after significant exposure to Legionella bacteria. Most cases of Legionnaires’ disease can be traced to plumbing systems where conditions are favorable for Legionella growth, such as cooling towers, whirlpool spas, hot tubs, humidifiers, hot water tanks, and evaporative condensers of large air-conditioning systems.

Legionnaires’ disease cannot be spread from person to person. Groups at highest risk for Legionnaire’s disease include people who are middle-aged or older, especially cigarette smokers, people with chronic lung disease or weakened immune systems and people who take medicines that weaken their immune systems (immunosuppressive drugs).