Featured photojournalist: Ricardo Moraes

Children from the Bare tribe play on the Negro river in the Cartucho community Photograph: Ricardo Moraes/Reuters A man from the Yanomami tribe waits to be operated on by doctors Photograph: Ricardo Moraes/Reuters A boy holds his dog in Santa Isabel do Rio Negro Photograph: Ricardo Moraes/Reuters A doctor performs surgery on a man from the Yanomami tribe Photograph: Ricardo Moraes/Reuters A man from the Yanomami tribe reacts as doctors operate on him Photograph: Ricardo Moraes/Reuters A woman with traditional piercings breastfeeds as she awaits medical attention Photograph: Ricardo Moraes/Reuters An indigenous man receives surgical attention Photograph: Ricardo Moraes/Reuters A man from the Bare tribe swims with his children on the river Negro Photograph: Ricardo Moraes/Reuters Children fight for fruit donated by the church during a ceremony to celebrate Saint Isabel in Santa Isabel do Rio Negro Photograph: Ricardo Moraes/Reuters Local women sit together after undergoing eye surgery Photograph: Ricardo Moraes/Reuters Afonso rests following the removal of a cancerous tumor Photograph: Ricardo Moraes/Reuters Men sit patiently while awaiting surgery Photograph: Ricardo Moraes/Reuters A woman from the Yanomami tribe looks pensive before undergoing surgery Photograph: Ricardo Moraes/Reuters