Journal
VACCINE
Volume 39, Issue 42, Pages 6210-6212Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.vaccine.2021.07.096
Keywords
COVID 19; BNT162b2; mRNA vaccine; Seroconversion; SARS-CoV-2
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The route of vaccine administration can impact the extent and quality of immune responses. A study showed that administering the Pfizer vaccine subcutaneously resulted in a seroconversion rate of 98.2% among military personnel, suggesting a potential alternative effective administration route.
Route of vaccine administration plays a role in extent and quality of immunogenicity. 790 military personnel accidentally received the first of two doses of Pfizer/BioNTech mRNA anti Covid-19 vaccine using a needle intended for subcutaneous administration. A serological blood test (on day 21, prior to the second intramuscular dose) was performed, analyzing whether immunological response was elicited. 98.2% demonstrated seroconversion. IgG titers were negatively correlated with age and did not correlate with BMI. Our results could help reassure providers confronted with a similar mistake and may even imply a possibly new and effective administration route. (C) 2021 Elsevier Ltd. All rights reserved.
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