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Early Strain of COVID-19 Spread Fast Because First Symptom Was Cough: Study

The COVID virus strain circulating in the United States during the pandemic's first wave spread so fast because it most often started with a cough, according to a new study.

It's likely that people with that strain -- D614G -- coughed and spread the virus before they were laid low by fever, the most common second symptom of infection, researchers explained.

"Studying the likely orde...