[Preprint] Revisão sistemática | Duração da efetividade das vacinas contra infecção por SARS-CoV-2 e COVID-19 – “Na maioria dos estudos, a efetividade contra COVID-19 grave continua alta (>70%) após 6 meses de vacinação completa, embora de fato haja alguma queda (na média, 8 a 10 pontos percentuais) entre 1 e 6 meses depois da vacinação.”
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