After two weeks in a strict lockdown that forced people to remain home except for essential business, Melbourne's five million residents will get more freedom to step outside from 11:59 p.m. local time (1359 GMT) on Thursday. Pfizer to test COVID-19 vaccine in larger group of children below 12 Pfizer Inc said on Tuesday it will begin testing its COVID-19 vaccine in a larger group of children under age 12 after selecting a lower dose of the shot in an earlier stage of the trial.