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Mourners carry the casket of Wilfredo Torres Rivera, 58, who died October 13 after jumping off a bridge into a lake, three weeks after Hurricane Maria, on October 19, 2017 in Utuado, Puerto Rico. Credit: Mario Tama/Getty Images

Officials still don't have an agreed upon number of storm-related casualties from Hurricane Maria, which slammed the island of Puerto Rico on Sept. 20, 2017, causing massive destruction to the island's infrastructure and knocking out the entire power grid.

Why it matters: Now a new study, published in the New England Journal of Medicine on Monday, finds a far higher estimate for the actual death toll, 4,645, than the official estimate of just 64.

Context: The death toll from this study means that Hurricane Maria killed more people than Hurricane Katrina did in 2005. That storm killed at least 1,833. It also eclipses the death toll on the day of the September 11, 2001 terrorist attacks, which killed 2,977.

Details:

  • The study found that the post-hurricane mortality rate was 14.3 deaths per 1,000 persons, which was a 62 percent increase from the pre-storm mortality rate during the same period in 2016.
  • Researchers say their estimated death toll is "likely to be an underestimate."
  • The study, by a group of Harvard University researchers as well as experts in Puerto Rico and elsewhere, found that the death toll from the Category 4 storm was actually 70 times higher than the official estimate.
  • The study's findings are consistent with other recent investigations that have found that storm deaths were far higher than the official count.

The big picture: The biggest factors leading to the higher death toll were disrupted medical services, including access to medication and medical facilities, the study found.

The government of Puerto Rico has requested an independent review of death-registry data to arrive at a more accurate official count of storm-related deaths, but the timing of this is unknown.

How they did it: Researchers surveyed 3,299 randomly chosen households across Puerto Rico to arrive at an independent mortality rate for all causes after the hurricane. They calculated excess deaths by comparing post-hurricane mortality rates with the same period the year before, when there was no major storm. According to the study, the death toll may have exceeded 5,000.

Between the lines: Public health experts remain deeply skeptical of the low death count in Puerto Rico from the most intense hurricane to hit that island in more than 80 years. This new study is the latest to dramatically increase the number of deaths, but it's unclear when the official count will be changed.

Go deeper: Thirty years of Atlantic hurricanes

Go deeper

10 mins ago - Sports

Simone Biles won't compete in individual vault or uneven bars Olympic finals

Photo: Fred Lee via Getty Images

Simone Biles will not compete in the individual vault or uneven bars finals at the Tokyo Olympics, USA Gymnastics announced Friday.

Why it matters: Biles drew global attention after stepping out of the individual all-around and team finals to prioritize her mental health. It's unclear if she will compete in the balance beam or floor exercise events.

11 mins ago - Sports

Caeleb Dressel breaks world record in men's 100m butterfly, wins 3rd gold in Tokyo

Photo: Jean Catuffe/Getty Images

American swimmer Caeleb Dressel broke the world record in the men's 100-meter butterfly final in Tokyo on Saturday, picking up his third gold medal of this year's Games.

The big picture: Hungary's Kristóf Milák won the silver, and Switzerland's Noe Ponti took the bronze.

Updated 3 hours ago - Health

DeSantis issues order barring Florida schools from mandating masks

Photo: Michael Reaves via Getty Images

Florida Gov. Ron DeSantis (R) on Friday issued an executive order that bars local school districts from requiring students to wear masks when they return to the classroom next month.

Why it matters: The spread of the Delta variant has led to a spike in new infections across the United States, triggering another round of debate about COVID guidelines in schools.

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