This 1978 electron microscope image made available by the Centers for Disease Control and Prevention shows Legionella pneumophila bacteria which are responsible for causing the pneumonic disease Legionnaires' disease. Poland's internal security officers were searching for the source of a deadly outbreak of Legionnaires' disease which has killed seven people and infected more than 100 others in the strategic city of Rzeszow, near the border with Ukraine, authorities said Friday, Aug. 25, 2023. (Francis Chandler/CDC via AP, File)
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