COVID-19 vaccines finally are headed for more kids as US regulators on Monday expanded the use of Pfizer’s shot to those as young as 12, sparking a race to protect middle and high school students before they head back to class in the fall.Shots could begin as soon as a federal vaccine advisory committee issues recommendations for using the two-dose vaccine in 12- to 15-year-olds, expected Wednesday.Vaccinating children of all ages will be critical to a return to normalcy. Most COVID-19 vaccines rolling out worldwide have been authorized for adults. Pfizer’s vaccine is being used in multiple countries for teens as young as 16, and Canada recently became the first to expand use to 12 and up. Parents, school administrators and public health officials elsewhere are anxiously awaiting the shot to become available to more kids.“This is a watershed moment in our ability to fight back the COVID-19 pandemic,” Dr. Bill Gruber, a Pfizer senior vice president who’s also a pediatrician, told The Associated Press.The Food and Drug Administration declared the Pfizer vaccine is safe and offers strong protection for younger teens based on testing of more than 2,000 U.S. volunteers ages 12 to 15. The study found no cases of COVID-19 among fully vaccinated adolescents compared to 18 among kids given dummy shots. More intriguing, researchers found the kids developed higher levels of virus-fighting antibodies than earlier studies measured in young adults.The younger teens received the same vaccine dosage as adults and had the same side effects, mostly sore arms and flu-like fever, chills or aches that signal a revved-up immune system, especially after the second dose.Pfizer and its German partner BioNTech recently requested similar authorization in the European Union, with other countries to follow.The latest news is welcome for U.S. families struggling to decide what activities are safe to resume when only the youngest family members remain unvaccinated.“I can’t feel totally comfortable because my boys aren’t vaccinated,” said Carrie Vittitoe, a substitute teacher and freelance writer in Louisville, Kentucky, who is fully vaccinated as are her husband and 17-year-old daughter.