________ is the physician first associated with vaccination.Group of answer choicesJennerEscherichPasteurKochLister

The correct answer is Jenner.

Explanation:

Edward Jenner is widely recognized as the pioneer of vaccination. In 1796, he conducted experiments that led to the development of the smallpox vaccine. Jenner observed that milkmaids who had contracted cowpox, a disease similar to smallpox, did not get sick from smallpox. He hypothesized that exposure to cowpox protected against smallpox. To test this, he inoculated a young boy with cowpox virus and later exposed him to smallpox, discovering that the boy did not develop the disease. This groundbreaking work laid the foundation for immunology and vaccination practices that have save countless lives throughout history.

Other figures like Louis Pasteur and Robert Koch made significant contributions to microbiology and vaccines, but Jenner is specifically associated with the concept of vaccination itself.