The highly-infectious Delta coronavirus variant has spread to at least 174 countries worldwide, from the US to Australia, causing a surge in COVID-19 cases. The variant has mutations that help it partially escape the immune response produced by vaccines.

The data for how well COVID-19 vaccines work against the Delta variant isn’t clear cut.

The vaccines may offer less protection against symptomatic illness caused by Delta compared to other variants.

Public Health England said in a report published on September 9 that, generally, COVID-19 vaccines were 79% effective against COVID-19 with symptoms caused by Delta after two doses.

Here’s how much protection COVID-19 vaccines give you against symptomatic Delta infections, based on the best available data from four studies.

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