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
What you should know
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In early March, Pennsylvania had not recorded any cases of COVID-19.
Click the arrows below to see how the number of positive tests and deaths have changed over time.
Here’s where Pennsylvania’s cases are:
