What was the most serious threat to a person's health in the early 1900s?

Name: What was the most serious threat to a person's health in the early 1900s?
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In the early 1900s, infectious diseases like tuberculosis, influenza, and pneumonia were the most serious threat to a person's health. Medical advancements like antibiotics and vaccines were not widely available yet, and public health measures such as sanitation and clean water were still in the early stages of adoption.

What Was the Most Serious Threat to a Person's Health