HealthHow good are the coronavirus vaccines at blocking transmission? Some covid-19 vaccines seem to excel at stopping the virus spreading as well as preventing disease, but vaccines alone still might not be enough to achieve herd immunity 51¶¯Âþ
HealthEverything you need to know about covid-19 vaccines for children Pfizer has announced positive results from its initial covid-19 vaccine trial in children and trials of other vaccines are under way, but whether any are approved for use this year may depend on how the virus behaves 51¶¯Âþ