The new variant, AY.4.2, is a descendant of the Delta variant. Cases are low outside the...

Real-world data from France shows Covid-19 vaccines give strong protection that lasts at...

Delta said in a memo that it had banned 1,600 passengers, and said airlines should all...

Protection from Pfizer and Moderna's Covid-19 vaccines wanes over time, but not all...

Scientists are closely watching the variant because of its potential to evade antibodies...

Experts said that, despite the falling numbers, there was a risk they could rise again if...

The country's strict lockdown appears to be containing an outbreak of the highly...

Prime Minister Jacinda Ardern said that Auckland, New Zealand's largest city and the...