Response to One Dose of COVID-19 Vaccine Strong for Previously Infected
TUESDAY, March 2, 2021 -- Individuals with previous severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection generate strong responses to one dose of the BNT162b2 vaccine, according to two research letters published online Feb. 25 in The Lancet.
Maria Prendecki, Ph.D., from Imperial College London, and colleagues investigated immunological responses to single-dose BNT162b2 among 72 health care workers (HCWs) who were vaccinated between Dec. 23 and 31, 2020. Twenty-one of the participants had evidence of previous SARS-CoV-2 infection and 51 were defined as infection-naive. The researchers found that postvaccination, anti-S titers were significantly higher in individuals with previous natural infection than infection-naive participants. In a subset of participants, in those with previous exposure, the vaccine induced very strong neutralizing antibody titers; vaccination induced detectable neutralizing antibodies in infection-naive individuals, but titers were lower. Those with evidence of previous SARS-CoV-2 infection at baseline mounted very strong T-cell responses to spike peptides; these responses were significantly weaker in the infection-naive group.
Charlotte Manisty, M.D., Ph.D., also from University College London, and colleagues undertook a nested case-control analysis of 51 participants of an ongoing longitudinal observational study of HCWs, 24 of whom had previous laboratory-confirmed mild or asymptomatic SARS-CoV-2 infection. All participants received their first dose of the BNT162b2 mRNA COVID-19 vaccine and were tested 19 to 29 days after. The researchers found that vaccination increased anti-S titers more than 140-fold from peak prevaccine levels among those with a previous SARS-CoV-2 infection. This increase was at least one order of magnitude greater than reported after a conventional prime-boost vaccine strategy in previously uninfected individuals.
"Our findings provide a rationale for serology-based vaccine dosing to maximize coverage and impact," Manisty and colleagues write.
Several authors from both studies disclosed financial ties to Oxford Immunotec.
© 2021 HealthDay. All rights reserved.
Posted: March 2021
Further Support and Information on COVID-19
Read this next
FRIDAY, April 16, 2021 -- For persons with a history of previous infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the neutralizing antibody titer is...
FRIDAY, April 16, 2021 -- Vaccinated Americans will probably need booster shots to guard against emerging coronavirus variants in the future, a White House adviser and Pfizer said...
FRIDAY, April 16, 2021 -- COVID-19 ups the risk for death with hemorrhagic stroke by more than twofold, according to a study published online April 14 in PLOS ONE. Vijay M....
More News Resources
- FDA Medwatch Drug Alerts
- Daily MedNews
- News for Health Professionals
- New Drug Approvals
- New Drug Applications
- Drug Shortages
- Clinical Trial Results
- Generic Drug Approvals
Subscribe to our Newsletter
Whatever your topic of interest, subscribe to our newsletters to get the best of Drugs.com in your inbox.