The logo comes from CDC -
This illustration, created at the Centers for Disease Control and Prevention
(CDC), reveals ultrastructural morphology exhibited by coronaviruses. Note the
spikes that adorn the outer surface of the virus, which impart the look of a
corona surrounding the virion, when viewed electron microscopically. A novel
coronavirus, named Severe Acute Respiratory Syndrome coronavirus 2
(SARS-CoV-2), was identified as the cause of an outbreak of respiratory illness
first detected in Wuhan, China in 2019. The illness caused by this virus has
been named coronavirus disease 2019 (COVID-19).
