Share Source: AP Photo/Rick Bowmer As soon as I saw the good news that Pfizer's COVID vaccine appeared safe and 100 effective in adolescents aged 12-15 in clinical trials, my initial thought was elation. More people protected from the virus, even low-risk people, is a wonderful development. My second thought was, "How long until teachers' unions start using this new information as a weapon and refuse to fully reopen classrooms until students are vaccinated?" Some union bosses had already made noises about this, having shifted the goalposts away from insisting that teachers receive priority for vaccines (which actually transpired in many places where schools nevertheless remain at least partially closed). I'm still concerned that this may evolve into the next prominent delay tactic. I've occasionally wondered if I've been too cynical on this whole front –