Experimental Ebola virus (EBOV) vaccines have previously been shown to protect animals against a high
dose intramuscular (IM) challenge, which is seen as a stringent challenge model. However, the protective
efficacy against other modes of infection, such as contact with infectious hosts, is unknown. Using a previously
established EBOV transmission animal model, we evaluated the efficacy of an adenovirus-based
EBOV vaccine given to guinea pigs (gps) 4 weeks before direct contact with untreated, infectious animals.
Prior vaccination resulted in robust levels of EBOV-specific antibodies and conferred complete protection
in gps. These results support the use of vaccines to prevent EBOV transmission between hosts.