Six-Month Follow-up after a Fourth BNT162b2 Vaccine Dose

Follow-up after a Fourth BNT162b2 Vaccine DoseAlthough a third vaccine dose showed an improved and sustained level of protection as compared with a second dose, the improvement in immunity from a fourth dose was smaller and had waned completely by 13 weeks after administration.

Automated summary

A fourth dose of the BNT162b2 vaccine resulted in a smaller improvement in immunity compared to a third dose, and this improvement disappeared completely after 13 weeks.