Nearly 12,000 people had asymptomatic infections.

One theory is that asymptomatic people may produce less infectious droplets, the authors said.

Genetics may also play a role.

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Verywell Health / Theresa Chiechi

And people without any symptoms throughout the course of infection can still pass it on."

That is why health experts recommend testing after a potential COVID exposure and isolating if you’re infected.

Even if you don’t feel sick, it doesn’t mean you’re not infectious at all.

Getting vaccinated and booster is also key to reducing COVID severity.

Even if youve already had a prior infection, vaccinationmay lower the risk of developing long COVID.

For the most recent updates on COVID-19, visit ourcoronavirus news page.

Rosenberg HF, ed.mSphere.

2020;5(5).