Yemen's civil war is a stew of local and foreign interests, from Washington, Saudi Arabia to Iran. And the latest battle may cost the lives of hundreds of thousands of civilians, if not millions.
The statistics point remorselessly towards obesity being a symptom with an underlying social cause. That should completely change the approach to dealing with it.
Why are some animals resistant to waterborne disease? A reader wants to know.
A woman takes an oral cholera vaccine in a hospital. But cholera vaccines are not always effective and never long lasting.
REUTERS/Andres Martinez Casares
Many states in Nigeria are reeling from cholera outbreaks. They need better health and sanitation infrastructure to disrupt transmission of the bacteria which cause the disease.
Aedes Aegypti mosquitoes viewed through a microscope in Broward County, Florida, in June 2016.
AP Photo/Lynne Sladky
Vast amounts of standing water in Houston and other hurricane-flooded areas are dangerous not only because of toxins. The water is a dangerous breeding ground for mosquitoes that transmit Zika.
A woman with symptoms of cholera walks into a cholera treatment center at Immaculate Conception Hospital in Les Cayes, Haiti in November 2016 in the aftermath of Hurricane Matthew.
Reuters/Andres Martinez Casares
Cholera is caused by a lack of access to clean drinking water and unhygienic conditions. Misuse of antibiotics makes it difficult and expensive to treat outbreaks.
The Bubonic plague slowed urbanisation, industrial development and economic growth in Europe for many years.
from www.shutterstock.com
Despite being so small they can't be seen with the naked eye, pathogens that cause human disease have greatly affected the way humans live for centuries.
Spanish flu killed more people than the Great War that preceded it. And tuberculosis even more than that.
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Cholera kills thousands every year but is treatable if it is caught early. Understanding how El Niño shifts cholera risks in Africa can help countries prepare for outbreaks and save lives.
Children at a camp for people displaced by Boko Haram insurgents in North-East Nigeria.
Flickr/Immanuel Afrolabi
More than 788 health facilities have been destroyed in parts of North-Eastern Nigeria captured by Boko Haram insurgents, crippling health services in the area.
Developed and developing countries alike struggle with water quality problems. For World Water Day, a look at the challenges – and some potential solutions – to better treating wastewater.
Places with poor sanitation and insufficient clean drinking water are at risk of cholera outbreaks.
Simon Akam/Reuters