https://www.mercurynews.com/2021/10/20/fda-approves-jj-moderna-boosters-oks-mixing/

By Matthew Perrone and Lauran Neergaard | Associated Press

WASHINGTON — U.S. regulators on Wednesday signed off on extending COVID-19 boosters to Americans who got the Moderna or Johnson & Johnson vaccine and said anyone eligible for an extra dose can get a brand different from the one they received initially.