[DanaC]

First `face-to-face' contacts are estimated to lead to the death of between a third and half of the population within the first five years (Hill and Hurtado 1996), sometimes more.

From

The dilemma of contact: voluntary isolation and the impacts of gas exploitation on health and rights in the Kugapakori Nahua Reserve, Peruvian Amazon

http://www.iop.org/EJ/article/1748-9..._4_045005.html

Most of the women and children had fled into the forest, he said, and those that were left had painted their bodies, taken up arms and appeared to be on a "war footing".

Experts believe that the hostile response is a clear indication that they understand that contact with the outside world spells danger. Across the border in Peru, similar tribes are being driven from their lands by aggressive oil and mining interests and illegal loggers.

Peru's President, Alan Garcia, has openly questioned the existence of uncontacted tribes. Meanwhile, evidence of the destruction of the forest has been piling up down river in the Brazilian state of Acre, where barrels of Peruvian petrol have washed up along with debris from logging operations. "What is happening in this region [of Peru] is a monumental crime against the natural world, the tribes, the fauna, and is further testimony to the complete irrationality with which we, the 'civilised' ones, treat the world," said Mr Meirelles.

After a decades-long political battle, indigenous groups now have their land rights protected under Brazilian law. The London-based charity Survival International is leading calls for Peru to act in accordance with international law and protect the tribes on its territory.

Survival's Fiona Watson, who recently returned from the region, said that Indians fleeing over the border into Brazil could be driven into conflict with uncontacted tribes already living there. "It is clear from this photograph that they want to be left alone," she said.

Encounters with the outside world are typically fatal for these tribes, who have no defences against the common cold and other commonplace diseases. "The groups are often fragments of much larger tribes that were overrun in the past and have died from disease or at the barrel of a gun," said Miss Watson.

The experience of the Akunsu tribe in neighbouring Rondonia, contacted a little over a decade ago, is not unusual. Today, only six members of the tribe survive. All relatives, they cannot marry and the group is expected to die out within a generation.

From the Independant article about the tribe in this thread.

http://www.independent.co.uk/news/wo...774.html?r=RSS