Twitter on Sunday permanently suspended the personal account of Representative Marjorie Taylor Greene, a Republican of Georgia, after the company said she had violated its Covid-19 misinformation policies.

Twitter said that Ms. Greene had a fifth “strike,” which meant that her account will not be restored. The company had issued her a fourth strike in August after she falsely posted that the vaccines were “failing.” Ms. Greene was given a third strike less than a month before that when she had tweeted that Covid-19 was not dangerous for people unless they were obese or over age 65, and said vaccines should not be required.

Ms. Greene’s official Congressional account, @RepMTG, remains active because tweets from that account did not violate the service’s rules.

“We’ve been clear that, per our strike system for this policy, we will permanently suspend accounts for repeated violations of the policy,” Katie Rosborough, a Twitter spokeswoman, said in a statement.

Ms. Greene did not immediately respond to a request for comment.

Her suspension comes as coronavirus cases have surged again in the United States from the highly infectious Omicron variant. New York State recorded over 85,000 new coronavirus cases on the last day of 2021, the highest one-day total in the state since the pandemic began, officials announced on Saturday.

Twitter has long banned users from sharing misinformation about the coronavirus that could lead to harm. In March, the company introduced a policy that explained the penalties for sharing lies about the virus and vaccines. People who violate that policy are subject to escalating punishments known as strikes and could face a permanent ban if they repeatedly share misinformation about the virus.

This is a breaking news story and will be updated.