What bothers Charlitte Godwin most about the monkey house?

Williams and Godwin discover the cache of dirty needles, Preston is alluding to the outbreaks of the Ebola virus in 1976 due to contaminated needles. While the needles found in the woods are not used for human injection, they serve as a reminder of the potential that human negligence can play in perpetuating disease. Even as USAMRIID believes the virus is contained in the Reston facility, it has already broken containment because the animal caretakers do not properly dispose of the syringes. Preston asks the readers to imagine the potential disaster if one of the children from the nearby center accidentally steps on an infected syringe.