Why do some people get very sick, while others show no symptoms? Dr. Sanjay Gupta breaks down one of the biggest questions about the virus.

We're now more than seven months into the coronavirus pandemic that has upended the lives of most of Earth's inhabitants. And while it is true that the scientific community has learned many things about the SARS-CoV-2 virus and the disease it causes, Covid-19, there are also many gaps in our understanding.

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