The World Health Organization said Friday, May 27, 2022, that nearly 200 cases of monkeypox have been reported in more than 20 countries not usually known to have outbreaks of the unusual disease. 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.
