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We still don't know how primates contract filoviruses in nature. The secondary cases of filovirus infection have been the result of contact with contaminated blood, organs, semen or other bodily secretions. Marburg, a filovirus closely related to Ebola, can be transmitted via semen up to 12 weeks after clinical recovery (1). Ebola can also be transmitted through the handling of ill or dead chimpanzees. Amongst humans, Ebola is transmitted by contact with infected bodily fluids and/or tissues (2, 3). There is evidence of a possible respiratory route of transmission of Ebola in nonhuman primates (3). Even if Ebola is transmitted via the respiratory route to nonhuman primates, humans may be resistant to the airborne/aerosol transmission of Ebola (may not have the right receptors).