Pfizer data suggest third dose of Covid-19 vaccine 'strongly' boosts protection against Delta variant

A third dose of the Pfizer/BioNTech Covid-19 vaccine can 'strongly' boost protection against the Delta variant -- beyond the protection afforded by the standard two doses, new data released by Pfizer on Wednesday suggests. The data posted online suggest that levels of antibodies that can target the Delta variant grow fivefold in people 18 to 55 who get a third dose of the vaccine.