Health officials are investigating 74 cases of hepatitis - or liver inflammation - in children across the UK since the start of this year.
A new outbreak of Zika virus is quite possible, warn researchers, with a single mutation potentially enough to trigger an explosive spread.
Stool tests might provide a useful way to help doctors spot early pancreatic cancer, say researchers.
A fourth Covid jab is not yet needed, say UK experts, because booster doses continue to provide high protection against severe disease from the Omicron variant among older adults.
Scientists believe they have found "the trigger" that leads to extremely rare blood clots after the Oxford-AstraZeneca Covid vaccine.
A woman from Argentina appears to have rid herself of HIV without drugs or treatment - the second documented case of its kind in the world.
A new mutated form of coronavirus that some are calling "Delta Plus" may spread more easily than regular Delta, UK experts now say.
People are twice as likely to need hospital care if they are sick with the Delta Covid variant, rather than the Alpha variant that was once prevalent in the UK, data from England suggests.
The Delta variant of Covid-19 has now been detected in 124 territories worldwide, the World Health Organization (WHO) says.
Children over 12 who are at higher risk of getting ill if they catch Covid will be offered the jab, the vaccines minister Nadhim Zahawi has confirmed.
