Risk of BA.5 Infection among Persons Exposed to Previous SARS-CoV-2 Variants.
João MalatoRuy M RibeiroPedro P LeitePedro CasacaEugénia FernandesCarlos AntunesVálter R FonsecaManuel C GomesLuís GraçaPublished in: The New England journal of medicine (2022)