Guns and disease ravage south Sudan

Nasir, Sudan, June 2009: Ethnic Nuer children play in a river near the town where tribal violence has killed hundreds of people in recent months Photograph: Finbarr O'Reilly/Reuters

Nasir: a Nuer tribewoman visits a clinic run by the charity Médecins Sans Frontières after receiving a gunshot wound during recent tribal violence Photograph: Finbarr O'Reilly/Reuters

Juba: a baby suffering from malaria lies in a ward in the main hospital in an area afflicted by the disease Photograph: Tony Karumba/AFP

Juba: James Miyak, left, and Peter Acihek, centre, and an unnamed man stand with their depleted herd; a rival tribe stole their cattle in an armed raid at night Photograph: John Domokos/Observer

Nasir: a blind Nuer woman recovers at a clinic run by the charity Médecins Sans Frontières after being shot in the arm during recent tribal violence Photograph: Finbarr O'Reilly/Reuters

Nasir: Nyachiew Gatbel, 20, an ethnic Nuer, sits in bed at a clinic run by the charity Médecins Sans Frontières after her arm was shattered by gunfire Photograph: Finbarr O'Reilly/Reuters

Juba: A dog waits with a malnourished child, Angelina, the daughter of James Miyak, whose Bari tribe's cattle was stolen by local tribe in a night time raid Photograph: Tracy McVeigh/Observer

Nasir: a woman from the Nuer tribe receives treatment at a health clinic run by the charity Médecins Sans Frontières Photograph: Finbarr O'Reilly/Reuters

Nasire 2009: Nuer tribesmen recover at a clinic after they were shot during a clash over cattle between two rival ethnic groups Photograph: Finbarr O'Reilly/Reuters

Nasir: cattle belonging to the Nuer tribe are shrouded in dung smoke to keep away insects near the town where disputes over cattle have turned violent Photograph: Finbarr O'Reilly/Reuters

Nasir: a Nuer girl waits to be admitted at a health clinic run by the medical charity Médecins Sans Frontières Photograph: Finbarr O'Reilly/Reuters

Nasir: Poch Mangok, 28, a member of the Nuer tribe, is fed porridge by a friend at a health clinic run by the Médecins Sans Frontières Photograph: Finbarr O'Reilly/Reuters

Nasir: A Nuer tribeswoman sleeps on a bench while waiting for treatment at a health clinic run by the charity Médecins Sans Frontières Photograph: Finbarr O'Reilly/Reuters

Gumbo: Susan Achan and Sebit Quintino escaped a kidnapping attempt by a rival tribe Photograph: John Domokos/Observer

Juba: AK-47s and uniforms of soldiers belonging to the Sudan People's Liberation Army are burned at the launch of a disarmament programme Photograph: Tim McKulka/UN Photo

Tereka: a south Sudanese mother and her child wait to be attended at a health clinic in an area where malaria is rife Photograph: Tony Karumba/AFP