The word vaccine is derived from the latin word vacca, meaning cow, and relates back to vaccine history when Edward Jenner developed a smallpox vaccine in the late 1700s made from cowpox.

A veterinarian’s take on the Measles and anti-vaxxers. The good Lord gave us bigger brains than the cattle we vaccinate.

Armed with the knowledge that milkmaids who had been exposed to cowpox, a relatively mild affliction, didn't come down with smallpox, Jenner intentionally infected an eight-year-old boy with cowpox.

This similar virus is cowpox. The cow to the left has been intentionally infected with cowpox virus. The fluid that you collect from virus-caused pustules on the cow's udder contains many copies ...