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A year after COVID first appeared: What do we know about the virus now? Updated Dec 13, 2020; The coronavirus pandemic arrived in the United States in January, with the first identified case on the West Coast on Jan. 20. While the pandemic continues to rage on across the country, with new cases and hospitalizations reaching their highest point yet, experts say a lot has been learned about how the virus is transmitted, who is most vulnerable to severe disease and what public health measures have been most effective. Here’s a look at what else has changed over the course of the pandemic.

United statesBoston universityTeds warrenDavidson hamerVin nortonJennifer hallerCristian lopezRobert finbergChristopher gillJerome adamsSteven senneCenters for diseaseWorld health organizationBoston university school of public healthBoston university school of medicineDepartment of global health at boston university