The COVID-19 Delta Variant Is 60% More Transmissible Than the Alpha Variant

A mutation of COVID-19 is spreading quickly throughout the world and threatens recovery efforts. The Alpha variant is believed to be 50% more transmissible than other local COVID-19 types. The Delta variant is 60% more transmissible than the Alpha variant.

Vaccine effectiveness is a concern with variants. Two doses of the Pfizer vaccine were 88% effective against the Delta variant (compared to 93% for Alpha). However, a single dose of Pfizer of AstraZeneca is 33% effective against Delta (compared to 50% for Alpha).

As a result, the WHO recommends that even vaccinated people wear masks.

Read Delta coronavirus variant: scientists brace for impact in Nature.

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