What are the COVID-19 variants Delta and Delta Plus and can we vaccinate against them | ABC News

The coronavirus has been mutating and the latest variants are now causing fresh waves of infection right around the world. The biggest concern is how much more transmissible this variant is.
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But why do viruses change? And does it mean that they can evade the vaccines that have been developed?
The Indian government has also detected another strain that’s been labelled Delta Plus. So far this strain has appeared in eleven other countries and it may be even more transmissible than Delta.

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