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Adapted from Bajema, et al., 2020, "Estimated SARS-CoV-2 Seroprevalence in the US as of September 2020"; Cartogram: Andrew Witherspoon/Axios

As of September, the vast majority of Americans did not have coronavirus antibodies, according to a new study published in JAMA Internal Medicine.

Why it matters: As the coronavirus spreads rapidly throughout most of the country, most people remain vulnerable to it.

By the numbers: Across the U.S., the portion of states' populations with detectable antibodies ranged from less than 1% to 23%. In most places, less than 10% of the population had them as of September.

  • The portion of people with antibodies was often lowest in older age groups — an ominous sign.

The intrigue: Emerging evidence suggests that antibodies wane over time. In New York — the epicenter of the spring's outbreak — the percentage of people with antibodies decreased from 23.3% in the first collection period to 17% in the final one.

Yes, but: Scientists are also discovering that antibodies may not be the body's only form of protection against the coronavirus, and how immunity works is still unclear.

The bottom line: As bad as the spring was in the Northeast, only a fraction of those states' populations actually got sick.

  • The surge of cases over the last few weeks, particularly in the Midwest and West, could easily have bumped other states up the list. But in most of the country, there is still plenty of human fuel to feed the coronavirus fire.

Go deeper

Jan 29, 2021 - Health

J&J says its one-shot vaccine is 66% effective against moderate to severe COVID

Photo: Thiago Prudêncio/SOPA Images/LightRocket via Getty Images

Johnson & Johnson announced Friday that its single-shot coronavirus vaccine was 66% effective in protecting against moderate to severe COVID-19 disease in Phase 3 trials, which was comprised of nearly 44,000 participants across eight countries.

Between the lines: The vaccine was 72% effective in the U.S., but only 57% effective in South Africa, where a more contagious variant has been spreading. It prevented 85% of severe infections and 100% of hospitalizations and deaths, according to the company.

Updated Oct 16, 2021 - Politics & Policy

Coronavirus dashboard

Illustration: Aïda Amer/Axios

  1. Vaccines: Booster shots overtake first doses in the U.S. — Pfizer to vaccinate entire Brazilian city as part of study — FDA panel endorses shot of J&J booster for adultsU.S. to lift restrictions for fully vaccinated international travelers on Nov. 8.
  2. Health: New cases down, but the West is at risk — Low vaccination rates exacerbate America's caregiving crisis — COVID is here to stay. So what does "victory" look like? — FDA will review Merck COVID-19 pill.
  3. Politics: NHL announces all but four players have been vaccinated — WHO names new advisory group on COVID origins — Biden admin warns Moderna to "step up" global vaccine supply.
  4. Education: LA extends deadline for school employee vaccinations amid staffing shortage — Parent sues Wisconsin school district after child tests positive — Arizona can't use aid for anti-mask education grants, Treasury says.
  5. Variant tracker: Where different strains are spreading.
Jan 29, 2021 - Health

NYC set to restart indoor dining in February, weddings in March

Outdoor dining in New York City in January. Photo: Alexi Rosenfeld/Getty Images

Gov. Andrew Cuomo announced Friday that if the current coronavirus positivity in New York City holds, indoor dining will reopen at 25% capacity on Feb. 14, one of the busiest dining days of the year.

Why it matters: The forced closure of indoor dining in December caused major backlash, as New York's struggling restaurant industry had already been hit hard by pandemic restrictions. Restaurants will still be required to close at 1o p.m.