Tens of thousands of volunteers are being recruited in a trial of a potentially "game-changing" blood test for cancer.
The vaccines are still providing strong protection, a year on from the initial two doses, says the scientist who developed the Oxford-AZ vaccine.
Israel's booster vaccination programme - offering a third shot to over-40s - has begun to show signs of success.
The EU and UK-Swedish drug-maker AstraZeneca have settled a row over a shortfall in coronavirus vaccines that affected the European rollout earlier this year.
The risk of "long Covid" in children is much lower than many had feared, leading child health experts have said.
Being fully vaccinated against Covid-19 not only cuts the risk of catching it, but also of an infection turning into long Covid, research led by King's College London suggests.
New Zealand has reported what it believes to be its first death linked to the Pfizer Covid-19 vaccine.
A major review of vaccines suggests the AstraZeneca jab does raise the risk of blood clots and another serious condition that can cause bleeding.
England saw a rise in young adults taking up smoking during the first lockdown, according to a study.
Some patients with impaired immune systems have a low or absent antibody response after receiving two doses of Covid vaccine, a UK study has found.
