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Surveillance report Open Access
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Abstract

Os vírus da gripe dividem-se em tipos A, B, e C, sendo o tipo A ainda dividido em subtipos. Os tipos A e B circulam nas populações humanas e modificam-se constantemente, originando a necessidade de, todos os anos, modificar as vacinas. Por vezes, surge um novo vírus da gripe ao qual ninguém é imune, porque não houve, anteriormente, nenhuma exposição a ele.

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/content/10.2807/esm.03.03.00088-pt
1998-03-01
2017-11-23
http://instance.metastore.ingenta.com/content/10.2807/esm.03.03.00088-pt
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