The parasitic disease Chagas is endemic in 60 per cent of Bolivia's territory. Access to diagnosis and treatment is limited and there is almost no treatment for sufferers over 15 years old. MSF is currently treating both adults and children, and is promoting and lobbying for wider access to treatment in the country. To date teams have treated some 3,000 patients with Chagas in Bolivia. Their challenge is to demystify this disease and integrate treatment into the national public health system.