Covid-19 roundup: Pfiz­er/BioN­Tech add on vac­cine da­ta for young chil­dren; Mex­i­co says it's miss­ing vac­cine dos­es from UN

A three-dose vac­cine se­ries was 73.2% ef­fec­tive in pre­vent­ing Covid-19 for chil­dren be­tween 6 months and 4 years old, Pfiz­er and BioN­Tech said Tues­day morn­ing.

The ef­fi­ca­cy up­date comes af­ter Pfiz­er and BioN­Tech’s vac­cine was au­tho­rized for emer­gency use in the youngest age group in June. That au­tho­riza­tion was sup­port­ed by in­ter­im da­ta that sug­gest­ed the vac­cine se­ries was 80% ef­fec­tive, with 10 symp­to­matic Covid cas­es in the vac­cine co­hort.

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