Question

which of the following pioneered epidemiological studies? edward jenner john snow joseph lister louis pasteur ignaz semmelweis

Explanation:

John Snow is known for his pioneering work in epidemiology. He investigated the 1854 Broad Street cholera outbreak in London, mapping cases to identify the source of the outbreak (a contaminated water pump). His methods laid the foundation for modern - day epidemiological studies. Edward Jenner is known for developing the smallpox vaccine, Joseph Lister for antiseptic techniques, Louis Pasteur for germ theory, and Ignaz Semmelweis for promoting hand - washing to prevent puerperal fever.

Answer:

John Snow