PREVENTING ZOONOTIC DISEASES
Except for smallpox vaccination, few tools for protecting people and animals from zoonotic diseases were available before the early 1900s. Methods such as thoroughly cooking meat, boiling milk, and quarantining sick animals were used to control diseases. In the 1920s commercial pasteurization became an effective way to prevent zoonotic diseases that are spread through raw milk or products made from raw milk. Insecticides came into use in the 1940s and helped protect against vector-borne diseases. Vaccines are available to protect animals and people against some zoonotic diseases but not all of them. In the 1950s, the United States started mandatory vaccination of dogs for rabies, and that has been a primary contributing factor in the decline in the number of rabies cases seen in people.
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