Elizabeth McGraw

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Professor of Entomology and Director of the Center for Infectious Disease Dynamics, Penn State

A few people in the crowd will be responsible for the bulk of a disease’s spread. Pacific Press /LightRocket via Getty Images

June 5, 2020

Epidemiological data suggests that 80% of COVID-19 cases can be traced to just 20% of those infected with SARS-CoV-2.

Whether by biology or behavior, some people in the crowd will transmit coronavirus to more than the average number of others. AP Photo/Kin Cheung

January 30, 2020

The novel coronavirus spreading outward from Wuhan, China, will get an assist from a subset of infected people who transmit it to many others.