The FDA is expected to authorize Pfizer’s COVID-19 vaccine for young adults age 12 and older by next week, according to a federal official and a person familiar with the process, setting up shots for many before the beginning of the next school year. … The federal official, speaking on the condition of anonymity to preview the FDA’s action, said the agency was expected to expand its emergency use authorization for Pfizer’s two-dose vaccine by early next week, and perhaps even sooner. The person familiar with the process, who spoke on condition of anonymity to discuss internal matters, confirmed the timeline and added that it is expected that the FDA will approve Pfizer’s use by even younger children sometime this fall.