Public health disasters were as numerous during the twentieth century as they were before French chemist Louis Pasteur discovered that bacteria caused illnesses in 1860. During the previous century, diseases that killed thousands of people did not have cures, but they were treated with newly developed vaccines. Other diseases were caused by man-made situations and now are prevented, and other diseases still do not have a cure nor a vaccine.

Types of Health Disasters

1. Epidemics
2. Famines

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