An Army nurse takes a blood sample to test for dengue fever at an Army field hospital at Military village in Rio de Janeiro April 8, 2008. Dengue has killed 67 people since January and infected more than 43,500 in Rio de Janeiro state, according to official figures. Last week, Health Minister Jose Temporao blamed a poor disease prevention network and fragile public health system for the crisis. Dengue is a viral disease spread by the Aedes aegypti mosquito and there is no vaccine or drug for it. REUTERS/Sergio Moraes (BRAZIL)
REUTERS/SERGIO MORAES