Scientists have found populations in the Peruvian Amazon that are displaying protection from rabies without actually ever being vaccinated. Ten percent of subjects tested have survived exposure to the rabies virus and did not receive any type of medical intervention. Previous conventional wisdom lead us to believe that 100 percent of rabies infections were fatal without immediate medical treatment.
Vampire bats who feed off mammalian blood often come out at night in the Amazon region where the study was conducted. In the absence of a food source vampire bats are known to feed off humans. Further research is being conducted into the immunity against the rabies virus that some Peruvians exhibit.