Some parents of younger children say a vaccine for the 5 and under kids has been a long time in coming. For one Decatur, Georgia, preschooler, it could be authorized a little too late. Harper Chiang, 4, endured 13 days of fever last month after being coinfected with SARS-CoV-2 and a parainfluenza virus. Her mother still plans to get her vaccinated as soon as possible.