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Illustration: Aïda Amer/Axios

Prior coronavirus infections appear to be much less protective against symptomatic Omicron reinfections than reinfection with other variants, according to a new study by Qatari researchers that has not yet been peer-reviewed.

Why it matters: If you're counting on your previous coronavirus infection to keep you from getting it again, don't.

The big picture: Initial studies have found that coronavirus vaccines — particularly without a booster shot — are much less effective against Omicron infections than other variants, although they appear to hold up well against severe disease.

  • This study suggests the same is true for people with prior infections, emphasizing the benefit of vaccines for this population.

By the numbers: The study found that prior infections were 90% effective against symptomatic reinfections for the Alpha variant, 92% effective for the Delta variant and only 56% effective for Omicron.

  • Effectiveness against hospitalization and death was 69% for Alpha, 100% for Delta and 88% for Omicron.

The bottom line: Omicron's remarkable ability to evade immune protection — either from vaccines or infection — goes a long way toward explaining its explosive case growth.

Go deeper

Updated 6 hours ago - Politics & Policy

Omicron dashboard

Illustration: Shoshana Gordon/Axios

  1. Health: Contact tracing fizzles across America — New clues emerge on long COVID — Omicron is finally burning out — It's very difficult to get access to antiviral COVID treatments — Axios-Ipsos poll: Omicron's big numbersAnother wave of death — FDA limits use of Regeneron and Lilly antibody treatments.
  2. Vaccines: Pfizer begins clinical trial for Omicron-specific vaccine — The shifting definition of fully vaccinated.
  3. Politics: Virginia AG says public colleges can't mandate COVID vaccines —Alaska governor joins Texas lawsuit over National Guard vaccine mandate — Navy discharges 45 sailors for refusing vaccine — Spotify to remove Neil Young's music after his Joe Rogan ultimatum — White House: 60M households have ordered free COVID-19 rapid tests.
  4. World: U.K. to lift travel testing requirement for fully vaccinated — Beijing Olympic Committee lowers testing threshold ahead of Games.
  5. Variant tracker
Updated 6 hours ago - Energy & Environment

Bomb cyclone prompts blizzard warnings from Virginia to Maine

Computer model projection showing the intense storm off of Cape Cod on Jan 29, 2022, with heavy snow and strong winds lashing the coastline. (Weatherbell.com)

Blizzard warnings are in effect for 11 million people from coastal Virginia to eastern Maine as a historic winter storm is set to slam the Mid-Atlantic and Northeast beginning Friday.

Why it matters: The storm will bring hazards ranging from zero visibility amid hurricane force wind gusts and heavy snow, to coastal flooding that will erode vulnerable beaches and threaten property from the Jersey shore to coastal Massachusetts.

Updated 6 hours ago - Politics & Policy

Omicron dashboard

Illustration: Shoshana Gordon/Axios

  1. Health: Contact tracing fizzles across America — New clues emerge on long COVID — Omicron is finally burning out — It's very difficult to get access to antiviral COVID treatments — Axios-Ipsos poll: Omicron's big numbersAnother wave of death — FDA limits use of Regeneron and Lilly antibody treatments.
  2. Vaccines: Pfizer begins clinical trial for Omicron-specific vaccine — The shifting definition of fully vaccinated.
  3. Politics: Virginia AG says public colleges can't mandate COVID vaccines —Alaska governor joins Texas lawsuit over National Guard vaccine mandate — Navy discharges 45 sailors for refusing vaccine — Spotify to remove Neil Young's music after his Joe Rogan ultimatum — White House: 60M households have ordered free COVID-19 rapid tests.
  4. World: U.K. to lift travel testing requirement for fully vaccinated — Beijing Olympic Committee lowers testing threshold ahead of Games.
  5. Variant tracker