Death rates of 90% are not typical. I'm not even aware of them in reliable literature, only their reporting in certain popular sources that aren't supported by

Death rates of 90% are not typical. I'm not even aware of them in reliable literature, only their reporting in certain popular sources that aren't supported by good evidence. The medical procedures for "contact" are pretty straightforward. You screen and temporarily quarantine the contact team for diseases. You ensure only those people are meeting with the indigenous group, and that the contact team isn't being exposed themselves. You have physicians and other medical staff available in the contact team to provide medical care. The goal isn't to prevent all disease transmission. That's not possible because "uncontacted" tribes are already interacting with the outside world. The Nomole people in TFA trade with their Piro cousins for example, and interact with loggers, miners mineral surveyors, among others. The goal is to minimize the transmissions you can control and provide the political/cultural/medical resources necessary to deal with whatever situation is initiating the contact process.