AdvertisementThe U.S. will offer nearly 300,000 doses of monkeypox vaccine in the coming weeksJune 28, 2022Will StonePien HuangfacebookEmailThis 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. (Cynthia S. Goldsmith, Russell Regner/CDC via AP)