On Friday, the Centers for Disease Control and Prevention released guidelines on schools reopening that said with proper mitigation measures, schools should be able to safely do at least some in-person learning.

\"PHOTO:
Chris Graythen/Getty Images, FILE
PHOTO: Paul Habans Charter School handed out supplies including food, books and computers to students and the community, when Louisiana schools closed due to the spread of coronavirus in New Orleans, La., March 17, 2020.
>

LA's teachers union, United Teachers Los Angeles, pushed back on the CDC's recommendation on the grounds that the guidelines don't do enough to address challenges in large urban districts like Los Angeles. \"Most troubling is that it does not require vaccinations for school staff, six-foot distancing in all schools, nor improved ventilation as a key mitigation measure,\" UTLA said in a statement.

Vaccinating teachers before schools reopen has been a sticking point for union members. \"Embedded in our bargaining framework are the components of a safe return,\" Cecile Myart-Cruz, UTLA's president, told ABC's Los Angeles station KABC-TV.

One of those key components is \"vaccines for all educators and school staff,\" Myart-Cruz added.

What to know about the coronavirus:

Tune into ABC at 1 p.m. ET and ABC News Live at 4 p.m. ET every weekday for special coverage of the novel coronavirus with the full ABC News team, including the latest news, context and analysis.

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