These 24 men, women and children belong to the same tribe as the "uncontacted" people who emerged in a Brazilian village in late June, claiming that they had suffered violent attacks from outsiders, according to Survival International, a group that advocates for tribal people's rights.

When isolated tribes make contact with people in settled communities, they are at risk of being wiped out by common diseases, such as the flu and measles, against which they have no immunity. The first wave of seven people to make contact developed flu-like symptoms last month, Brazilian officials said. They were treated for acute respiratory infections and put in quarantine before they went back to their home territory, which is across the border in Peru. [See Photos of the Uncontacted Amazon Tribes].