95 million people in the US have had Covid 19 at one time or another, according to the CDC. Some people say they haven't gotten the disease yet.

Is it luck or immunity?

Andrew is a Pennsylvania resident.

Andrew and his wife were able to avoid getting Covid-19 during the Pandemic.

It is a point of pride for me right now. "I'm really proud of it." said the Pennsylvania resident.

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Researchers say there's more to these people than they're being called "COVID-19 super dodgers"

The University of California, San Francisco has a cohort of people who are completely asymptomatic.

A group of researchers at the University of California, San Francisco are trying to figure out what's going on.

Genetics and the immune response intersect.

She said they are talking to people who tested positive but never developed any symptoms.

Hollenbach said that the person was quickly clearing the virus at that point that it hadn't set up any symptoms.

Even though a person has been exposed to the virus, they can't develop symptoms.

There are continuing stories.

People who have been exposed to the seasonal flu may have immunity.

Hollenbach said that people with this type of HLA have an immune response that is really effective against a related coronaviruses.

She said it's more than one medical phenomenon.

There are many reasons why we want to know about those people. What do they look like after? Does that increase their immune response?

The research hasn't been published yet. Experts think that this information could help develop more effective vaccines.

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