Tag Archives: immunity

COVID vaccines: why second boosters are being offered to vulnerable people in the UK – but not young and healthy people yet

nednapa/Shutterstock Rebecca Aicheler, Cardiff Metropolitan University Until recently, the UK government limited a fourth dose of the COVID vaccine to people with severely weakened immune systems over the age of 16. But, following a resurgence of COVID cases in the UK, the government has followed some other countries such as Israel, Germany and Sweden, and expanded the eligibility for a …

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Hybrid immunity: a combination of vaccination and prior infection probably offers the best protection against COVID

Kateryna Kon/Shutterstock Grace C Roberts, University of Leeds and Lena Glaser, Queen’s University Belfast When we’re exposed to a pathogen such as a virus, our immune system identifies it as a foreign invader and mounts an attack. This ultimately results in the formation of antibodies which can neutralise the invading pathogen next time we encounter it. It’s a complex process. …

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How effective are vaccines against omicron? An epidemiologist answers 6 questions

Understanding how much protection a vaccine offers is not as simple as it sounds. Andriy Onufriyenko/Moment via Getty Images Melissa Hawkins, American University The pandemic has brought many tricky terms and ideas from epidemiology into everyone’s lives. Two particularly complicated concepts are vaccine efficacy and effectiveness. These are not the same thing. And as time goes on and new variants …

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Covid-19: Por qué la inmunidad de grupo es una pésima idea

Shutterstock / Lightspring Sara Lumbreras, Universidad Pontificia Comillas and Mario Castro Ponce, Universidad Pontificia Comillas Para detener la pandemia solo hace falta una cosa: que durante la ventana de tiempo en la que un infectado puede transmitir la enfermedad a otras personas, no lo haga. Sobre el papel, esta medida es sencilla; en el mundo real, es extremadamente compleja de …

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