Role of common people in controlling the spread of disease

How fly spreads diseases?

Housefly spreads diseases

Housefly spreads diseases

Housefly spreads diseases

Statement: A large number of patients admitted in a particular hospital have been diagnosed with a serious contagious disease. Courses of action I. These patients should be immediately evicted from the hospital for fear of spread of the disease. II. The hospital should make appropriate quarantine arrangements to control the spread of disease.

Which one does not spread disease

In what way have microbes played a major role in controlling disease caused by harmful bacteria ?