![This 2003 electron microscope image made available by the Centers for Disease Control and Prevention shows mature, oval-shaped monkeypox virions, left, and spherical immature virions, right, obtained from a sample of human skin associated with the 2003 prairie dog outbreak.](https://www.gpb.org/sites/default/files/styles/flexheight/public/2022-08/ap22180013744346-4a18a840776c1c687de6bd615ae636a831126dbb_1.jpeg?itok=dRcF4iPZ)
Caption
This 2003 electron microscope image made available by the Centers for Disease Control and Prevention shows mature, oval-shaped monkeypox virions, left, and spherical immature virions, right, obtained from a sample of human skin associated with the 2003 prairie dog outbreak.
Credit: Cynthia S. Goldsmith, Russell Regner/CDC via AP, file