Malnourished child. African father feeding his malnourished son protein-rich porridge. The boy is suffering from visceral leishmaniasis (kala-azar), caused by Leishmania sp. , a parasitic protozoan. The porridge boosts the child's immune system, increasing his chances of survival. Leishmaniasis is a tropical disease transmitted by bites from infected sand-flies. This is the more serious form which causes fever, enlargement of the spleen, liver damage, and, without treatment, sometimes even death. Photographed in Sudan.