Fourth BNT162b2 vaccination neutralization of omicron infection after heart transplantation.
J Heart Lung Transplant
; 41(9): 1210-1213, 2022 09.
Article
in English
| MEDLINE | ID: covidwho-1819498
ABSTRACT
We investigated changes in receptor-binding domain IgG and neutralizing antibodies against the omicron and delta variants, vs the wild-type virus, in response to a fourth BNT162b2 dose in 90 heart transplant (HT) recipients. The fourth dose induced anti-RBD IgG antibodies and a higher neutralization efficiency against the wild-type virus and the variants; however, neutralization efficiency against the omicron variant was lower than that against the delta variant (the latter demonstrating efficacy similar to that against the wild-type virus). Notably, while IgG anti-RBD antibodies were detectable in >80% of the HT recipients, only about half demonstrated neutralization efficiency against the omicron variant. A SARS-CoV-2-specific-T-cell response following the fourth dose was evident in the majority of transplant recipients. Boosting vulnerable groups improves antibody responses (including neutralizing responses) and cellular immunity, but the incomplete immunological response, particularly for omicron, suggests continued preventive measures and optimization of vaccination strategies that elicit strong, and long-lasting immune responses, in this high-risk population, should remain a priority.
Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Heart Transplantation
/
COVID-19
/
BNT162 Vaccine
Type of study:
Experimental Studies
/
Prognostic study
/
Randomized controlled trials
Topics:
Vaccines
/
Variants
Limits:
Humans
Language:
English
Journal:
J Heart Lung Transplant
Journal subject:
Cardiology
/
Transplantation
Year:
2022
Document Type:
Article
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