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Sen. Roger Wicker (R-Miss.). Photo: Tom Williams/CQ-Roll Call via Getty Images

Sens. Roger Wicker (R-Miss.), Angus King (I-Maine) and John Hickenlooper (D-Colo.) have tested positive for breakthrough cases of COVID-19, their offices said Thursday.

The big picture: At least four vaccinated senators have tested positive in August, including Sen. Lindsey Graham (R-S.C.), who announced his breakthrough positive test result earlier this month.

What they're saying: "Senator Wicker is fully vaccinated against COVID-19, is in good health and is being treated by his Tupelo-based physician. He is isolating, and everyone with whom Senator Wicker has come in close contact recently has been notified," Phillip Waller, Wicker's communications director, said in a statement.

  • Waller added that Wicker's symptoms are mild.
  • King said in a statement: "While I am not feeling great, I’m definitely feeling much better than I would have without the vaccine. I am taking this diagnosis very seriously, quarantining myself at home and telling the few people I’ve been in contact with to get tested in order to limit any further spread."
  • Hickenlooper said in a statement: "After experiencing mild symptoms, I tested positive for a breakthrough case of COVID-19. I’m feeling much better and will continue to isolate at the direction of the Congressional Attending Physician."
  • "I’m grateful for the vaccine (and the scientists behind it) for limiting my symptoms and allowing us to continue our work for Colorado," Hickenlooper added.

Between the lines: "Breakthrough" COVID-19 cases are rare, with less than 0.1% of vaccinated Americans testing positive for the virus. Those who are infected are less likely to have severe cases than unvaccinated individuals.

Editor’s note: This post has been updated with new details throughout.

Go deeper

Updated 15 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Aïda Amer/Axios

  1. Vaccines: CDC says some immunocompromised people can get fourth COVID shot — FDA panel endorses Pfizer vaccines for 5-11 year olds — Moderna says vaccine shows strong immune response in kids
  2. Health: COVID cases, deaths at meat plants were far higher than previously thought — 96% of Tyson Foods employees vaccinated ahead of mandate deadline — U.S. releases updated vaccination, testing rules for foreign travelers
  3. Politics: Louisiana lifts mask mandate except for some schools — Alabama governor orders state agencies to fight federal vaccine mandate — Axios-Ipsos poll: Confidence in Biden COVID recovery tumbles
  4. Education: Benefits of vaccine for children outweigh risks, FDA says — Education secretary reveals limits to Biden’s mask push on states — LA extends deadline for school employee vaccinations.
  5. Variant tracker: Where different strains are spreading.
Updated 11 hours ago - Health

NYC firefighters union urges members to defy mayor's vaccine mandate

New York City Mayor Bill de Blasio. Photo: Michael M. Santiago/Getty Images

The president of New York City's firefighters union told reporters Wednesday that he's advised unvaccinated members to ignore Mayor Bill de Blasio's COVID-19 vaccine mandate for city workers, per Reuters.

Why it matters: Under de Blasio's order that's due to take effect Friday, unvaccinated city employees would be placed on unpaid leave. But Uniformed Firefighters Association head Andrew Ansbro said he told members that "if they choose to remain unvaccinated, they must still report for duty," according to Reuters.

Judge rejects Southwest pilots' challenge to vaccine mandate

A Southwest Airlines plane leaves the gate at Baltimore Washington International Thurgood Marshall Airport on Oct. 21. Photo: Kevin Dietsch/Getty Images

A judge ruled that Southwest Airlines can mandate its 9,000 pilots to be vaccinated against COVID-19, declining a union request for a restraining order on the policy, per AP.

Details: U.S. District Judge Barbara Lynn said in her ruling against the Southwest Airlines Pilots Association on Tuesday that the airline was meeting its goal on air transportation safety and "providing 'safe and reasonable working conditions' for pilots, by preventing the spread of disease" with the requirement, the Dallas Morning News noted.