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 ¿ìè¶ÌÊÓÆµ
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 ¿ìè¶ÌÊÓÆµ