Pfizer COVID-19 vaccine proving safe for kids brings hope to families still at home Pfizer COVID-19 vaccine proving safe for kids brings hope to families still at home A Pfizer COVID-19 vaccine trial is proving to be 100% effective in preventing children from getting the virus and that means families can continue getting back to normal. A return to normal life is the hope of many after going through 2020. For some, that means going to bars or ballgames, but for some families, that means just being able to send children back to school. "The twins have a condition called spinal muscular atrophy. They are very high risk," says Chris Byrd, a father of three.