For the first time in 10 years, global malaria cases are no longer falling, sparking concerns about a resurgence of the too often deadly disease.
Experts and philanthropist, Bill Gates, urged country leaders gathering at the Commonwealth Summit in London to pledge more money to fight the illness.
In 2016, there were 216 million cases of malaria in 91 countries, an increase of five million compared with 2015.
Malaria cases have been increasing in some parts of the Americas, Southeast Asia,Western Pacific and Africa, although in many other regions infections are stable or going down.
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.
The U.K government has said it will invest £500m a year for the next three years to help fight malaria.
The Bill & Melinda Gates Foundation will extend its investments in malaria by an additional $1bn through to 2023.
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