A powerful new Covid strain is capable of re-infecting patients within weeks of them recovering from the virus, doctors from around the world fear. BA.5 has become the new dominant infection in ...

The risk of reinfection with the omicron coronavirus variant is more than five times higher, and it has shown no sign of being milder than delta, a study showed, as cases soar across Europe and ...

These “public epitopes” mean that the generation of new antibodies is far from random and that a virus may be able to mutate a single amino acid to reinfect a population of previously immune ...

A new study claims that the latest omicron subvariant can reinfect people who have been vaccinated or already been infected with COVID. The study in the New England Journal of Medicine discovered ...

Illustration: Nick Collingwood/WSJ University of Oxford scientists plan to reinfect dozens of adult volunteers with the coronavirus in the second U.K. clinical trial to study deliberate Covid-19 i ...

The COVID Omicron sub-variant BA.2, informally dubbed the "Stealth Omicron" variant, is able to reinfect people who have already had Omicron, a new study suggests. BA.2 has been under close ...

“When we reinfect these participants, we will know exactly how their immune system has reacted to the first COVID infection, exactly when the second infection occurs, and exactly how much virus ...

Dr Fauci has warned that people who have recovered from COVID could be re-infected by the variant B.1.351, and urged the public to get vaccinated. More Mandel Ngan/AFP via Getty Images ...

5 and, to a lesser degree, BA.4 — that not only are ultra-contagious but have shown the ability to reinfect those who contracted earlier Omicron strains. According to the latest figures from the ...