Johns Hopkins University

Testing programme for antibodies by Imperial College London involved 100,000 volunteers

Many countries that believed they were past the worst ‘grappling with new outbreaks’

Officials cautious in country of 3.5m that appears to have pandemic under control

Experts voice despair at president Jair Bolsonaro’s response as toll surpasses 42,000

World round-up: China reports first local transmission in weeks; Australia eliminates virus in many parts of country

World round-up: More than 7m cases globally; Pakistan not likely to see peak before August

It may be hard to avoid crises but it is vital to make them both small and rare

Country says it is working to improve ‘quality and quantity’ of its nuclear weapons

Filmmaker behind Nightmare on Elm St and Scream franchises dies following illness

Leader Kim Jong Un oversees test from offshore location, authorities claim

North Korea under UN sanctions banning it from developing ballistic missile technology

Chinese experts warn regime may already have 20 warheads and capacity for 80 more

Practical outcome of oath is uncertain but IS influence has been obvious for a while

The ‘Cable Cowboy’ is America’s biggest landowner. Now he’s snapping up property this side of the Atlantic

We’re getting better at treating cancer, with survival rates growing all the time. So why is the incidence of the disease expected to double by 2040?

Property purchases in Ireland help Liberty Global chairman John Malone avoid tax

More continue to join tens of thousands on streets as crowds are urged to stay the course

Viagra has been one of the best-known pills sold by Pfizer

Healthcare reform is being stymied because of an ideology that is hostile to any kind of state support