"Dutch King Willem-Alexander and curator Mieneke te Hennepe, left, tour the ""Contagious!"" exhibit at Rijksmuseum Boerhave in Leiden, Netherlands, Thursday, July 16, 2020. The museum finally opened an exhibition Thursday on contagious diseases through the ages after a long delay caused by the disease currently sweeping the world, COVID-19. (AP Photo/Peter Dejong, Pool)"
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