Question $7$

$0\mathrm{.}5$ pts

In $1847,$ what obstetrician observed that mothers who gave birth in hospital wards staffed by physicians and medical students were more likely to suffer and die from puerperal fever after childbirth $(10\%-20\%$ mortality rate$)$ than were mothers in wards staffed by midwives $(1\%-1\mathrm{.}5\%)$ mortality rate$)?$

Girolama Fracastoro

Ignaz Semmelweis

Joseph Lister

Louis Pasteur