How contagious are people with asymptomatic SARS-CoV-2, and how does the immune system respond to asymptomatic infection? The potential for SARS-CoV-2 to be spread by people who never exhibit symptoms of disease or those who exhibit delayed symptom onset is a serious concern and possible contributing factor to the pandemic spread of this virus. Not surprisingly, “stealth transmission,” as it is sometimes called, is especially difficult to identify and contain. But in order to effectively fight the spread of disease, we need to better understand how this virus behaves, especially as it pertains to asymptomatic cases.
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