 In 1968, several workers at the county's department of health came down with a fever and mild flu symptoms, but not pneumonia.After the 1976 Legionnaires' outbreak in Philadelphia, the Michigan health department re-examined blood samples and discovered the workers had been infected with the newly identified "Legionella pneumophila".An outbreak caused by" Legionella micdadei" in early 1988 in the UK became known as Lochgoilhead fever.