Vaccinators Joan Love and Mary Hanafin administering Covid-19 vaccinations at the   Aviva Stadium, Co Dublin. File photograph: Alan Betson

Early in the pandemic, when vaccines for coronavirus were still just a glimmer on the horizon, the term “herd immunity” came to signify the endgame: t(...)

Andrea Mulcahy gazes into her backyard outside her home in Ocala, Florida. Her  husband, Tim, who believed that he contracted the coronavirus from a co-worker, died in July  at the age of 52. Photograph: Zack Wittman/New York Times

A nation numbed by misery and loss is confronting a number that still has the power to shock: 500,000. Roughly one year since the first known death by(...)

Chaplain Kevin Deegan prays with Covid-19 patient Esperanza Salazar, as she speaks with family members remotely, at Providence Holy Cross Medical Centre in the Mission Hills neighbourhood  in Los Angeles, California. Photograph: Mario Tama/Getty

The US has now passed the once-unthinkable tally of 500,000 people dead from Covid-19 – almost matching the number of Americans killed in the second W(...)

Scientists worry that if vaccinated people are silent spreaders of the virus, they may keep it circulating in their communities, putting unvaccinated people at risk. Photograph:  Matthew Horwood/Getty

The new Covid-19 vaccines from Pfizer and Moderna seem to be remarkably good at preventing serious illness. But it’s unclear how well they will curb t(...)

US president Donald Trump posted an article thanking his sister for supporting him online. It was prompted by an account set up by a 21-year-old from Pennsylvania. Photograph: Oliver Contreras/EPA

Last month, between tweets disputing his election loss, US president Donald Trump posted an article from a conservative website that said his sister E(...)

Firemen pray before sanitizing a building in Shah Alam, outside Kuala Lumpur, Malaysia on Tuesday. Photograph: Ahmad Yusni/EPA

More than 43.5 million cases of coronavirus have been recorded worldwide with more than 1.1 million deaths, according to the latest data from Johns Ho(...)

Pitkin County volunteer election official John Ortega (left), guides a voter as he drops his ballot after voting in person on the first day of early voting at the Aspen Jewish Community Center earlier this week. Photograph: Kelsey Brunner/The Aspen Times/AP

More than 84,000 people were diagnosed with Covid-19 across the United States on Friday, according to a Reuters tally, a record one-day increase in in(...)

Relatives mourn during the burial of 65-year-old Maria Joana Nascimento in August, who died suspectedly from the coronavirus, at Vila Formosa Cemetery, in the outskirts of Sao Paulo, Brazil. Photograph: Nelson Almeida/AFP/Getty Images

New cases of Covid-19 in the United States hit a two-month high on Friday with more than 58,000 infections reported as Brazil surpasses 150,000 corona(...)

Photograph: iStock

Twitter is rethinking how the labels it applies to misinformation look and work, its head of site integrity told Reuters in an interview, as the socia(...)

Professor John McGeehan, director of the Centre for Enzyme Innovation at the University of Portsmouth. Photograph: University of Portsmouth/Stefan Ventur/PA Wire

A new cocktail of enzymes that speeds up the degradation of plastic offers a step forward in finding a new form of recycling that is faster, more affo(...)

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