COVID-19 vaccine to public as world watches—U.S. passed up chance to lock in more Pfizer vaccine doses— Millions of hungry Americans turn to food banks for the first time— Biden’s health team offers glimpse of his COVID-19 strategy— Years of research laid groundwork for speedy COVID-19 shots___Follow AP’s coverage at https://apnews.com/hub/coronavirus-pandemic and https://apnews.com/UnderstandingtheOutbreak___HERE’S WHAT ELSE IS HAPPENING:BEIJING — Health authorities in Chengdu identified three more cases of coronavirus, bringing the southwestern Chinese city’s total to five in the latest outbreak.