People who were bitten by a snake (either venomous or not) scored lower in fear of snakes; people could become fear immunized even against highly biologically prepared fearful stimuli

Coelho, Carlos M., Panrapee Suttiwan, and Andras N. Zsido. 2019. “Fear Inoculation Among Snake Experts.” PsyArXiv. August 24. doi:10.31234/osf.io/ph5ug

Abstract: Prepared phobias are often seen as acquired rapidly, generalize broadly and are resistant to extinction. Nonetheless provided opportunity for innocuous contact with certain kinds of stimuli people tend to show less fear when compared with others who never or rarely deal with the same stimuli. This study finds that people who were bitten by a snake (either venomous or not) scored lower in fear of snakes, as measured by the SNAQ-12, and SPQ surveys. These fearless people also have more experience with snakes than those who were not bitten. Results suggest that people could become immunized even against highly biologically prepared fearful stimuli, such as snakes, after a certain amount of previous benign exposure. We stress that lack of fear might bring people to become unworried and develop extreme risk of snakebite envenomation, which has recently (2017) been classified by the World Health Organization as a category A neglected tropical disease.