The emergence of an invasive species of mosquito that is resistant to insecticides is driving up malaria numbers in Africa.

The spread of a mosquito in East Africa that thrives in urban areas and is immune to insecticide is fuelling a surge in malaria that could reverse decades of progress against the disease, experts say.

The spread of a mosquito in East Africa that thrives in urban areas and is immune to insecticide is fuelling a surge in malaria that could reverse decades of progress against the disease, experts say.