Anna Charlotte Ruys | |
|---|---|
 Ruys as chairman (left) speaking to the former chairman of the Medical Women's International Association Dr. Esther P. Lovjoy in 1948 | |
| Born | 21 December 1898 |
| Died | 8 February 1977 |
| Nationality | Kingdom of the Netherlands |
Anna Charlotte Ruys or Charlotte Defresne-Ruys (1898 – 1977) was a Dutch professor of bacteriology and epidemiology. She became a proponent of hygiene in public health and an activist against biological warfare.