Before the 20th century, the principal threats to health in our society were

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Prior to the 20th century, contagious diseases such as tuberculosis, cholera, and smallpox were the leading causes of death in society. It wasn't until the development of vaccines and advancements in medical technology that these diseases were brought under control. Farm accidents, heart diseases, and various forms of cancer were not as prevalent as contagious diseases in the past.

Before the 20th Century, the Principal Threats to Health in Our