30 July 2014 Last updated at 17:28 ET
By Helen Briggs Health editor, BBC News website
Malaria-infected red blood cells
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Drug-resistant malaria is spreading in South East Asia, and has now reached the Cambodia-Thailand border, according to a study.
“Radical action” is needed to prevent further spread of malaria parasites resistant to key drugs, say scientists.
The spread could undermine recent gains in malaria control, they report in the New England Journal of Medicine.
No evidence was found of resistance in three African sites – Kenya, Nigeria and the Democratic Republic of Congo.
The study analysed blood samples from more than 1,000 malaria patients in 10 countries across Asia and Africa.