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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. On Wednesday, May 18, 2022, Portuguese health authorities confirmed five cases of monkeypox in young men, marking an unusual outbreak in Europe of a disease typically limited to Africa. (Cynthia S. Goldsmith, Russell Regner/CDC via AP) ** FILE **

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. On Wednesday, May 18, 2022, Portuguese health authorities confirmed five cases of monkeypox in young men, marking an unusual outbreak in Europe of a disease typically limited to Africa. (Cynthia S. Goldsmith, Russell Regner/CDC via AP) ** FILE **

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