LIST: California will expand vaccine eligibility in March for people who are at high risk for serious illness from COVID-19

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California will expand vaccine eligibility on March 15 for people ages 16 to 64 who are at high risk for serious illness from COVID-19.

Read the full list of severe health conditions here.

As of March 15, millions of people between the ages of 16 and 64 will be eligible shots, including those with:

Down syndrome

severe obesity

And some heart conditions

Also on the list:

pregnant women

cancer patients with a weakened immune system

and people with a high-risk disability that could make it especially difficulty for them to get proper COVID care.

When the expansion comes, Dr. Mark Ghaly, the state's health secretary, says there will be a total of up to roughly 19 million people eligible for shots in California. Providers may have to make some tough choices.

Ghaly says state officials will be working out the details with providers and stakeholders over the coming weeks.

"Bottom line, is we are still very dealing very much with the scarcity of vaccine," Ghaly says. "To make sure we are doing this as consistently as possible across the state and not overlooking those who are homebound in more remote areas and doing what we can to make sure we achieve equity and fairness."

A letter going out to providers notes "the list of eligible conditions is subject to change" as experts get more data and analyze it.