Mystery solved: Health officials reveal likely cause of outbreak in Argentina

A mysterious outbreak that sickened 11 people in Argentina, killing four, has been solved.

Health authorities said the illness was likely caused by Legionella, the bacteria that leads to Legionnaires' disease.

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Minister of Health Carla Vizzotti said during a press conference Sunday that four samples -- including blood, respiratory and tissues samples -- of the deceased patients tested positive for the bacteria.

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However, Minister said the results are preliminary and further testing is being conducted.

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