Thursday, February 16, 2017

NPR Notícias de negócios: Germ History: Milkmaids Inspire Vaccines, But The Germs Keep Coming

Germ History: Milkmaids Inspire Vaccines, But The Germs Keep Coming
After milkmaids helped discover vaccination, we spent the next 150 years learning how to keep ourselves safe from germs. By the 1960s, we thought the battle was finally over. If only!

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