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A health care worker administers a dose of the Pfizer-BioNTech Covid-19 vaccine to a teenager on Paqueta Island, Rio de Janeiro state, Brazil. Photo: Maria Magdalena Arrellaga/Bloomberg via Getty Images

Pfizer will vaccinate all residents over the age of 12 in the Brazilian city of Toledo as part of a study measuring the effectiveness of its COVID-19 vaccine, the company said in a statement.

Why it matters: Researchers in the study hope to monitor viral transmission in a real-life scenario after the population has been inoculated.

The big picture: The study will be in conjunction with Brazil's National Vaccination Program, local health authorities, a hospital and a federal university, Reuters reports.

  • The study will follow the residents for up to one year to see how long vaccine protection lasts, Pfizer said in a statement.

Background: Toledo, which has a population of about 143,000, has already seen 98% of its population take a first dose, and 56% are fully vaccinated, per Reuters.

  • "Here we believe in science and we lament the almost 600,000 deaths from COVID-19 in Brazil," said Beto Lunitti, the town's mayor, at a news conference Wednesday.

Editor's note: This story has been updated with the statement from Pfizer.

Go deeper

How one local leader is pushing for COVID boosters

Illustration: Brendan Lynch/Axios

At the Triangle View Apartments on B Street SE, Beatrice Evans, 68, is helping her neighbors get their shots.

On Oct. 27, Evans, the building’s tenant association president, is organizing a vaccine clinic to offer COVID-19 booster shots to the residents, largely Black seniors.

Why it matters: 49 of the 50 D.C. residents who since June have died of COVID-19 were Black, according to an analysis of DC Health data first reported by DCist.

Bryan Walsh, author of Future
2 hours ago - Politics & Policy

Axios AM Deep Dive: America’s murder surge

Photo illustration: Sarah Grillo/Axios. Photo: Erik McGregor/LightRocket via Getty Images

Homicides rose at the fastest rate in at least six decades last year. This Axios AM Deep Dive, led by Future correspondent Bryan Walsh, looks at the state of gun crime.

6 hours ago - Politics & Policy

Senate Democrats target billionaires

Illustration: Annelise Capossela/Axios

After failing to get a deal on other planned tax increases, key Senate Democrats are pivoting to a billionaires' income tax to pay for President Biden's social spending.

The big picture: No advanced economy has attempted anything similar on such a scale.