The article states the government tries exactly to prevent this from happening since the isolated tribe is about to have contact with a non-isolate tribe:

> Anthropologists now fear that, as well as the prospect of both tribes launching deadly attacks on each other, the potential of contact between the Matis and the other, as yet still isolated Korubo tribe, as well as the desire expressed by the breakaway tribe to reestablish contact with their relatives, could lead to a breakout of disease which could bring the ancient tribe to extinction.