A study of chimpanzee social hierarchy in Uganda's Kibale National Park has shed light on the best way to prevent disease among the animals, findings that could also be useful for human disease control. Ecology researcher Julie Rushmore concluded that vaccinating animals higher in the chimpanzee pecking order, such as mothers, juveniles from larger families and dominant males, may reduce disease transmission. "This work can easily be applied to other systems," Rushmore said. "... Ultimately, we want to develop vaccination strategies that could both prevent large outbreaks and lower the number of animals requiring vaccination."