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Immunofluorescent light micrograph of SARS-CoV-2 particles (green) found in the hypothalamus of the brain at post-mortem. SARS-CoV-2 is the cause of the respiratory disease covid-19. The virus has been shown to spread to other organs, including the brain. Viral RNA (ribose nucleic acid) can remain detectable for months after initial infection. (KEYSTONE/SCIENCE PHOTO LIBRARY/NIAID/NATIONAL INSTITUTES OF HEALTH/SCIENCE PHOTO LIBRARY)