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La pandémie continue, et les variants
sont devenus la dernière préoccupation,

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avec des exemples notables
détecté en Afrique du Sud,

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Brésil et Royaume-Uni.

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Mais les variantes sont compliquées.

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Chacune est faite a partir
d'un ensemble de mutation,

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qui ont tous la force de changer
le virus SARS-CoV-2

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de manière inattendue.

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Alors, que veulent dire les scientifiques
quand ils parlent de variantes?

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Et qu'est-ce que cela peut signifier
pour l'avenir de la pandémie?

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Les virus se multiplient
en copiant leurs génomes encore et encore.

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Mais comment une vieille photocopieuse,
ces copies ne sont pas toujours parfaites.

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Chacune de ces copies imparfaites
est une variante.

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Normalement les imperfections ou mutations
ne change pas le comportement du virus,

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et ils peuvent souvent le rendre
mois réussi que la souche d'origine.

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Mais très rarement, des mutations
peuvent changer le virus

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d'une manière importante.

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Cela pourrait devenir plus contagieux,

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ou plus capable de éviter
le système immune.

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Plus un virus est permis

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