Autor: CDC/ Fred Murphy; Sylvia Whitfield
Título: A transmission electron micrograph of a tissue section containing variola viruses.
Origem: This media comes from the Centers for Disease Control and Prevention's Public Health Image Library (PHIL), with identification number #2291
Fonte: https://commons.wikimedia.org/wiki/File:Smallpox_Tissue_section_containing_variola_orthopox_viruses_TEM_PHIL_2291_lores.JPG?uselang=da
Licença: Domínio Público
11-09-1978