Poor Antibody Response after Two Doses of SARS-CoV-2 vaccine in Transplant Recipients.

A low anti-spike antibody response of 28.6% was observed 28 days after BNT162b2 vaccine second dose among 133 solid organ transplant-recipients without previous COVID-19. No serious adverse events were recorded. Four severe COVID-19 cases were reported between or after the two doses. Our data suggests to change the vaccine strategy.