pfizer booster shot for children 12 to 15 years old. the current situation has some schools returning to remote learning, new york public schools are open for in-class instruction. the nation's largest school system welcomes students back after holiday break with enhancing testing protocols. >> we're going to double down on testing, to get as many people tested as possible. the safest place for our children we know is in a school building. people not in school are not in their rooms, they're in the street not wearing a mask, some not getting the food they deserve, so this is the most important thing we can do, to keep the schools open and allow children to receive the support they deserve. >> the outbreak has affected defense secretary austin who is tested positive and is isolating. he met with the president december 21st and tested negative on that day.