Angola's yellow fever outbreak has killed more than 300 people since December, with cases of the deadly disease spreading to the Democratic Republic of Congo, Kenya and even China, the World Health Organization has said.

The outbreak was first detected in the capital Luanda at the end of last year, and has now been confirmed in most coastal and central regions of the west African country.

Member states of the World Health Organization have agreed a long-awaited reform of the agency so that it responds more quickly and effectively to emergency situations.

They've brought hope to millions, drugs so revolutionary that they can cure hepatitis C and so expensive that neither patients nor public health services can afford them -- an issue to be raised at this week's G7.

Children are being put to work on tobacco plantations in Indonesia that supply some of the world's biggest cigarette companies, putting their health at serious risk, Human Rights Watch warned Wednesday.

Despite Indonesian law prohibiting child labor in hazardous industries, the rights group documented dozens of cases of minors -- some as young as eight -- falling ill from handling raw tobacco and mixing pesticides with their bare hands.

About one in five men over age 80 lose the Y chromosome from their blood cells, and this condition has now been linked to an increased risk of Alzheimer's disease, researchers said Monday.

The owner of an Indian restaurant in Britain was on Monday jailed for six years for killing a customer with a nut allergy by making him a takeaway containing peanuts.

Lego products are becoming increasingly violent as toymakers engage in an "arms race" to retain children's attention in the digital age, New Zealand researchers said Monday.

The World Bank announced Saturday a new program to mobilize funds quickly against virulent disease outbreaks after the world was caught unprepared in the 2014 Ebola disaster in West Africa.

World Bank President Jim Yong Kim said the new Pandemic Emergency Financing Facility (PEF) will accelerate global and national responses to disease outbreaks that threaten large populations and fragile economies.

The governor of the U.S. state of Oklahoma on Friday vetoed a bill outlawing abortion, saying it was too vague and would not stand up to legal challenges.

"The bill is so ambiguous and so vague that doctors cannot be certain what medical circumstances would be considered 'necessary to preserve the life of the mother,'" Governor Mary Fallin said in a statement that labeled the measure "unconstitutional."

The days of branded cigarette packets in Britain and France are over as new plain packaging laws came into effect on Friday, hailed by campaigners despite resistance from tobacco firms.