This electron microscope image made available and color-enhanced by the National Institute of Allergy and Infectious Diseases Integrated Research Facility in Fort Detrick, Md., shows Novel Coronavirus SARS-CoV-2 virus particles, orange, isolated from a patient. University of Hong Kong scientists claim to have the first evidence of someone being reinfected with the virus that causes COVID-19. They said Monday, Aug. 24, 2020 that genetic tests show a 33-year-old man returning to Hong Kong from a trip to Spain in mid-August had a different strain of the coronavirus than the one he’d previously been infected with in March. (NIAID/National Institutes of Health via AP)