Antispike IgG antibody decay after immunisation with fractional versus full booster doses of COVID-19 vaccines: a 6-month longitudinal analysis of the FRACT-COV trial in Brazil

Barros Verruck, J., Moreira Puga, M. A., Oliveira, R. D. de, Vieira da Silva, P., Charu, V., Hedlin, H., … Croda, J. (2025). Antispike IgG antibody decay after immunisation with fractional versus full booster doses of COVID-19 vaccines: a 6-month longitudinal analysis of the FRACT-COV trial in Brazil. BMJ Public Health, 3(2), e002331. https://doi.org/10.1136/bmjph-2024-002331