The effectiveness of Pfizer and BioNTech's COVID-19 vaccine wanes rapidly against the Omicron variant, beginning to fade away as soon as three weeks after the second or third dose, a new study finds.
Researchers said that the antibody responses induced by a second and third dose of the vaccine were "transient" and that "additional booster doses may be necessary," although the vaccine still provides enough immunity to ward off hospitalization and death from COVID-19.
The Danish study, which was published in JAMA Network Open on Friday, examined 128 people who had received two or three doses of Pfizer/BioNTech's mRNA vaccine.
Pfizer vaccine's protection against Omicron drops as soon as three weeks after third dose: Study
Researchers said that the antibody responses induced by a second and third dose of the vaccine were "transient" and that "additional booster doses may be necessary," although the vaccine still provides enough immunity to ward off hospitalization and death from COVID-19.
The Danish study, which was published in JAMA Network Open on Friday, examined 128 people who had received two or three doses of Pfizer/BioNTech's mRNA vaccine.
Pfizer vaccine's protection against Omicron drops as soon as three weeks after third dose: Study