LONDON - Global malaria cases are no longer falling, for the first time in 10 years, sparking concerns about a resurgence of the too often deadly disease.
Experts, and philanthropist Bill Gates, are urging country leaders gathering at the Commonwealth summit in London to pledge more money to fight the illness.
In 2016, nearly half of the world's population was at risk of malaria.
There were 216 million cases of malaria in 91 countries, an increase of five million compared with 2015.
Without more investment and preventive action, we could see even more malaria and rising deaths, experts warn.
Malaria cases have been increasing in some parts of the Americas, South-East Asia, Western Pacific and Africa, although in many other regions infections are stable or going down.
Speaking on the Today programme, on Radio 4, Bill Gates said the mosquitoes had started adapting but the goal was still to cut cases in half.
"If we stand still, the insecticides we use stop working, the drugs stop working because the parasite itself evolves around that, so this is a game where you are either falling behind or getting ahead."
He said that with new money, better surveillance and "great scientists" working on how to combat the disease, there was hope.
"This kills hundreds of thousands of children in Africa so unless we make big progress here we won't be doing what we owe Africa," Mr Gates said.
Part of the problem is that the mosquitoes and parasites that cause and spread malaria are developing resistance to the weapons we use to fight them - insecticides and antimalarial drugs.
An experimental new vaccine, Mosquirix, is already being used to protect young children in selected areas of Africa, which is home to 90% of malaria cases and 91% of malaria deaths.
But developments take time and money - and global funding to combat malaria has plateaued.
A new commitment to halve malaria cases over the next five years could save 650,000 lives across the Commonwealth, according to experts.(FA)