For millions of Tanzanians, a potentially deadly disease is just one bug bite away.
It is a threat that lurks in the shadows as the sun falls, flutters through holes in bednets at night and multiplies in puddles after a summer storm.
Throughout history, more people have died of malaria than of any other disease. Despite recent global advances, malaria still kills more than 1,000 children each day, most in sub-Saharan Africa.
For the 1.3 million people on the islands of Zanzibar, off the coast of Tanzania, the bite of the Anopheles mosquito has always been a real and present danger.