Born by caesarian section to a Hepatitis B positive mother, Chance had a 50/50 chance of being born Hepatitis B positive. Fortunately she wasn't but it didn't save her from years in isolation. For her first 5 years Ch-442 lived completely alone with no chimpanzee companions and little human contact. In 14 years, Chance participated in 4 studies; her last 6 years in the lab she wasn't used at all. Too neurotic and aggressive, Chance would bite her fingers, pull her hair out and slap herself continually. In the month following her last study, Chance was treated for severe diarrhea, dehydration and weight loss. Using her again may have resulted in her death.