Mai, P.P., Vân, H.T.H., Sơn, H.H., Quang, N.N. and Giang, L.M. 2023. 28. The prevalence of Sars-Cov reinfection among healthcare workers at Bac Ninh General Hospital and Nghe An Friendship General Hospital in 2022-2023. Journal of Medical Research. 165, 4 (Apr. 2023), 240-253. DOI:https://doi.org/10.52852/tcncyh.v165i4.1588.