Por que a vacina contra a Covid-19 não é anual como a da gripe?

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[{"selector":"#anim-a3ab263d-3c3f-4858-abf7-bb8b49f56395","keyframes":{"opacity":[0,1]},"delay":0,"duration":1500,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-48b6f984-d7cc-4b31-bacb-afefcd4443bc","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-5fb24e45-f3a7-48db-abdd-0775928284dc","keyframes":{"opacity":[0,1]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-39c74b39-3805-4c01-87a0-1528a43196f7","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-9c51d304-fd24-4a69-9a37-01aed0370f74 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate3d(26.922780232950977%, 0, 0)","translate3d(0%, 0, 0)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] O coronavírus, embora tenha mutações, mantém características que as vacinas atuais conseguem combater com eficácia. Já o vírus da influenza sofre mutações mais rápidas e frequentes, exigindo atualizações anuais da vacina Catherine Falls Commercial/GettyImages

[{"selector":"#anim-8c1e72eb-af8e-4e5d-b1f6-ed523aef3876","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-6598bc70-62d4-4969-9982-6bbef72328dd","keyframes":{"transform":["translate3d(0px, 203.42593%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-c52863cd-9c37-4a13-9a19-5e325daa3fe5","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-86f3352d-0b7a-4071-8f19-f828a641e134","keyframes":{"transform":["translate3d(0px, 180.79826%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] A principal razão é que o comportamento do vírus da Covid-19 (SARS-CoV-2) ainda está sendo monitorado e não segue um padrão sazonal tão bem definido quanto o da gripe, que ocorre predominantemente no inverno. O SARS-CoV-2 sofre mutações frequentes, mas de forma menos previsível que o vírus influenza Filipe Piastrelli, infectologista e coordenador do SCIH (Serviço de Controle de Infecção Hospitalar) do Hospital Alemão Oswaldo Cruz

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