Brazil released a video documenting the contact event between a formerly isolated tribe and villagers on the Envira River.
The tribe explained that they had come from across the border in the Alto Purús National Park and had suffered attacked from armed non-indigenous people, most likely narcotic traffickers. Several tribesman have machetes, indicating previous contact with people with access to manufactured goods. Several members of the group were treated for the flu. It is not known whether it spread to the rest of the tribe. With no immunity to illnesses from the outside world, these contact events often result in devastating epidemics. Additional information available here.