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Blood was drawn at days 0 (baseline), 7, and 14 postvaccination in December 2020 and January 2021 (draws could be within 1 day from assigned day). Participants were vaccinated with either the Pfizer-BioNTech or Moderna vaccine, depending on personal preference and availability.
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Health care workers who had previously enrolled in a hospital-wide serosurvey study, 3 conducted from July to August 2020 at the University of Maryland Medical Center, were randomly contacted based on stratification into 3 groups: SARS-CoV-2 IgG antibody–negative (Ab-negative) IgG-positive asymptomatic COVID-19 (asymptomatic) and IgG-positive with history of symptomatic COVID-19 (symptomatic). I also hope that the participants of this study will be monitored to better understand the long term ramifications of vaccinating those who already have had an immune response to SARS-COV-2. I hope this study can be repeated with a larger sample size. This may turn out to be true, but we have no evidence to support the idea that these same people will develop antibodies in response to a vaccine. Some may argue that it's possible that there is a subset of the population who may get COVID-19 and recover, but never develop antibodies. Instead, those who have already presented a healthy immune response should wait until a) we have more information about the long term effects of the available vaccines and b) they are at least 8 months past their previous COVID-19 infection. The default position should not have been to vaccinate anyone who meets age and comorbidity thresholds. If we want to maximize the distribution of the vaccine, let's focus on segments of the population who do not already have antibodies to COVID-19. This study's results imply something many have been advocating for from the onset of the vaccine. We need to have results at 12 months to evaluate the persistence of these antibody titers.įinally, in my opinion, two questions remain open:Ī) whether the same results can be obtained with the AstraZeneca vaccine and with the one-shot Janssen vaccine recently approved by the FDA and both based on different techniques respecting mRNA vaccines andī) the effect of these two vaccines on binding and neutralization antibody titers. Whether the type of vaccines administered (Moderna vs Pfizer) may affect in any way the binding and neutralization antibody titers.ģ. Whether the interval time between infection and vaccine administration in symptomatic patients may affect the reported results on binding and neutralization antibody titers.Ģ. However, some additional data would be useful to report:ġ.
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This work adds more insight into how to prevent SARS-CoV-2 infection in symptomatic or asymptomatic health care workers previously infected by this virus. I read with interest the letter published online first in JAMA on Maby Saman Saadat and coworkers (doi:10.1001/jama.2021.3341).