Disease Assessment Division, US Army Medical Research Institute of Infectious Disease, Fort Detrick, Frederick, MD 21701.
An epizootic caused by an Ebola-related filovirus and by simian haemorrhagic fever virus began among cynomolgus monkeys in a US quarantine facility after introduction of monkeys from the Philippines. This incident, the first in which a filovirus has been isolated from non-human primates without deliberate infection, raises the possibility that cynomolgus monkeys could be a reservoir of Ebola virus infection.