This is a carousel. Use Next and Previous buttons to navigate 1of3FILE – 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. Africa’s public health agency says it doesn’t know how many of the continent’s reported monkeypox cases this year are in men who have sex with men, and it warned Thursday, Aug.