The floodwaters have now largely receded and fewer than 10,000 people remain in temporary camps, down from 1.4 million at the height of the crisis but people face several disease outbreaks.
As the Saudi-led coalition prepares to attack the port of Hudaida, Saudi-backed forces on the ground say they cannot guarantee what would happen to the trapped civilians.
Health officials say they are working hard to get out accurate information about the deadly hemorrhagic fever but face significant mistrust in a part of Africa where many place more faith in clerics in white collars than doctors in white coats.
The new outbreak has infected 11 people including three nurses. Government experts will meet on Thursday to discuss measures to prevent the disease from crossing the border and spread to neighbouring countries.
The new bed net has a special chemical that blocks mosquitoes resistance to insecticides and in a test has proven to cut malaria prevalence by as much as 44 percent.
As the city of Mosul tries to recover from war, doctors are warning of a new catastrophe: infectious and water-borne diseases.
The infectious disease is re-emerging at a time when the country is in the throes of an economic crisis, threatening to overwhelm a crippled health care system. The number of reported cases increased 40 percent or more in the last year In Caracas.
Brazil has launched a campaign to vaccinate more than 23 million people in response to a yellow fever outbreak that has killed more than 200 people, according to the country's Health Ministry.
The UN refugee agency says Rohingya refugees in Bangladesh face flooding, landslides and disease and must be relocated.
Scientists have made a major advance towards developing a blood test for cancer that could identify tumours long before a person becomes aware of symptoms.
UN aid officials also warn that access for humanitarian deliveries to Yemen remains a concern as the country's health care system is on the brink of collapse.
Police arrested 55 people in Lusaka after residents rioted over a curfew and ban on street vending imposed to control a cholera outbreak, the Zambian government says.
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