Multiple choice Semmelweiss was famous for the following discovery: many microbes are made of a single cell handwashing reduces the spread of disease cells arise from cells cleanliness is important when taking care of patients Reveal answer Fill a bubble to check yourself B Correct answer Explanation Ignaz Semmelweis discovered that handwashing by medical staff significantly reduced the incidence of puerperal fever in maternity wards. His findings were a landmark in the history of hygiene.