Transmission electron micrograph of SARS-CoV-2 virus particles, isolated from a patient. Image captured and color-enhanced at the NIAID Integrated Research Facility (IRF) in Fort Detrick, Maryland. (via NIAID)
Via National Institute for Allergy and Infectious Diseases
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In early March, Pennsylvania had not recorded any cases of COVID-19. Here’s a look at how the number of positive tests has grown:
Since a coronavirus was first reported in Wuhan, China, in December, the infectious respiratory disease has spread rapidly within the country and to neighboring countries and beyond.
Here’s where Pennsylvania’s cases are:
