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Articles sur Vaccines

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Vaccine efficacy statistics are often based on the results of randomized controlled trials. (Art-Aleatoire.com)

How effective are COVID-19 vaccines? Here’s what the stats mean … and what they don’t

Vaccine efficacy is usually expressed as a percentage, but what is it actually measuring? Statisticians explain what the numbers mean, and what they say about how well a vaccine can protect us.
A high school student gets his COVID-19 shot at a pop-up vaccine clinic at a public charter school in Los Angeles. Al Seib / Los Angeles Times via Getty Images

Shutting down school vaccine clinics doesn’t protect minors – it hurts people who are already disadvantaged

For decades, US schools have been common sites for vaccine clinics to respond to outbreaks and provide catch-up immunizations. So why are they suddenly controversial?
Edward Jenner vaccinating his son, held by Mrs Jenner; a maid rolls up her sleeve, a man stands outside holding a cow. Coloured engraving by C. Manigaud after E Hamman. The Wellcome Collection.

Eradicating smallpox: the global vaccination push that brought the world ‘arm-to-arm’

The major problem in Britain and elsewhere was complacency. The early success in suppressing smallpox, and indeed eliminating it in some places, led parents to neglect vaccination.
As coronavirus cases surge, unvaccinated people are accounting for nearly all hospitalizations and deaths. Fat Camera/E+ via Getty Images

US is split between the vaccinated and unvaccinated – and deaths and hospitalizations reflect this divide

The US has split into “two Americas,” one of the unvaccinated and one of the vaccinated. The differences in deaths and hospitalizations between the two populations are striking.
Information on COVID-19 vaccines for pregnant or breastfeeding individuals has been inconsistent and hard to find. (AP Photo/Charles Krupa)

Should I get the COVID-19 vaccine while pregnant or breastfeeding? Experts explain the safety, evidence and clinical trials

Exclusion from clinical trials, lack of data and inconsistent information made it difficult for pregnant and breastfeeding people to make decisions about COVID-19 vaccines early in the rollout.

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