Twitter says it will apply warnings to tweets that contain misleading information about COVID-19 vaccines and implement a strike system of enforcement that could see users permanently banned for repeat violations.

The social media network started promoting public health information before COVID-19 was declared a global pandemic.

It also aimed to remove demonstrably false or misleading content about the virus that had the highest risk of causing harm.

Since introducing its COVID-19 guidance, it said it had removed more than 8400 tweets and challenged 11.5 million accounts.