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Illustration: Eniola Odetunde/Axios

A small fraction of vaccinated Americans experienced "breakthrough" cases of COVID-19, and an even smaller number were hospitalized, new data from the CDC shows.

By the numbers: As of April 30, there were a total of 10,262 breakthrough infections reported across the U.S., when about 101 million Americans had been vaccinated. The majority of those cases (63%) occurred in females and the median patient age was 58 years old.

  • The preliminary data shows that 27% of the breakthrough infections were asymptomatic.
  • 10% of the patients were known to be hospitalized and 2% of the patients died. Of the hospitalized patients, 29% were asymptomatic or hospitalized for a reason unrelated to COVID-19.

What they're saying: "The number of COVID-19 cases, hospitalizations, and deaths that will be prevented among vaccinated persons will far exceed the number of vaccine breakthrough cases," the CDC said.

Go deeper

Sep 1, 2021 - Health

Texas school temporarily closes after two teachers die from COVID-19 in a week

American and Texas state flag. Photo: David Paul Morris/Bloomberg via Getty Images

A school in Texas closed for the rest of the week on Tuesday after two teachers died from COVID-19 within a week, the Waco Tribune-Herald reports.

State of play: The campus at Connally Junior High School won't open until after Labor Day for deep sanitation, after sixth-grade social studies teacher Natalia Chansler died on Aug. 28, having notified the school three days earlier that she tested positive for COVID-19.

Sep 2, 2021 - Health

Israeli coronavirus vaccine booster data gives the U.S. hope

Illustration: Annelise Capossela/Axios

Preliminary Israeli data shows that coronavirus booster shots quickly spike a person's protection against both severe disease and infection, suggesting that the additional shots could help blunt the virus' spread in the U.S. — although it's very unclear how much.

Why it matters: The Biden administration has said that the main rationale for its booster push is to stay ahead of any waning of the vaccines' effectiveness against severe disease. But slowing the spread of the Delta variant would be a welcome bonus.

Sep 2, 2021 - Health

Fauci: Mu COVID variant not an "immediate threat" to U.S.

Anthony Fauci. Photo: Chip Somodevilla/Getty Images

NIAID director Anthony Fauci said at a press briefing Thursday that the coronavirus variant Mu, which the World Health Organization is now tracking, does not pose an immediate threat to the U.S.

Driving the news: WHO added the Mu strain, first detected in Colombia in January, to its "Variants of Interest" list Monday, warning that early data suggest it may be more resistant to protection from prior infection or vaccination.