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. The spread of monkeypox in the U.S. in 2022 could represent the dawn of a new sexually transmitted disease, or it could yet be contained. Or it might be too early to tell. (Cynthia S. Goldsmith, Russell Regner/CDC via AP, File)
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