Yesterday, Florida followed Norway by not recommending the Covid vaccine for children. The CDC recommends them. What does the data say? As public health scientists, we must be honest both with what we know and what we do not know. The emergency use authorization for the Pfizer-BioNTech mRNA vaccine for children was based on two randomized clinical trials for ages 5-11 and 12-15, respectively, with a total of 4,528 subjects. In both trials, there was a reduction in mild Covid infections during the two months following the second dose, with the vaccine efficacy in the 68% and 98% range for the younger children and somewhere between 75% and 100% for the 12-15-year-olds (95% confidence intervals). What these numbers mean is that if the true value is, e.g., 90%, and if 100 children would have been infected without vaccination, then 90 of them will avoid the infection if vaccinated, while 10 children will still get infected despite being vaccinated. A …