WEBVTT

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Conforme sigue la pandemia, las variantes se han convertido en la preocupación más reciente,

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con ejemplos señalados detectados en Sudáfrica,

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Brasil y el Reino Unido.

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Pero las variantes son complejas.

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Cada una está compuesta de un conjunto de mutaciones,

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todas las cuales pueden potencialmente cambiar el virus SARS-CoV-2

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de maneras inesperadas.

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Entonces, ¿a qué se refieren los científicos cuando hablan de variantes?

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¿Y qué significa esto para el futuro de la pandemia?

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Los virus se multiplican copiando sus genomas una y otra vez.

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Pero, como en una fotocopiadora vieja, esas copias no siempre son perfectas.

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Cada una de esas copias imperfectas es una variante.

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Generalmente, las imperfecciones o mutaciones no cambian el comportamiento del virus

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y a menudo pueden hacerlo menos eficiente que la cepa original.

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Pero de manera muy, muy poco frecuente,

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las mutaciones pueden cambiar el virus

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