This iamge provided by the National Institute of Allergy and Infectious Diseases (NIAID) shows a colorized transmission electron micrograph of monkeypox particles (orange) found within an infected cell (brown), cultured in the laboratory. NIAID via AP hide caption
An emergency declaration frees up resources to help fight the monkeypox outbreak. There are currently more than 6,600 cases in the U.S. Mario Tama/Getty Images hide caption
A man wearing a face mask to curb the spread of coronavirus walks past a health campaign poster in the Westminster underground train station, in London. Matt Dunham/AP hide caption