Autor: Pan American Health Organization PAHO
Título: Edward Jenner, English physician who discovered the smallpox vaccine in 1796
Data: 28 de Maio de 2010
Fonte: https://www.flickr.com/photos/pahowho/9525240640
Licença: https://creativecommons.org/licenses/by-nd/2.0/
21-01-1799