People in the presymptomatic stage are highly contagious.
“The peak of viral shedding occurs right before symptoms develop and immediately after, when the symptoms are still mild,” Dr. Narasimhan says.
Sanjay Gupta, MD, CNN's Chief Medical Correspondent, also previously said that those who are presymptomatic are highly contagious. "People tend to be the most contagious before they develop symptoms, if they're going to develop symptoms," he said in a recent CNN article.
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