ACVPM Infectious Diseases Practice Exam

The idea here is to identify which host type sustains the virus within a population over the long term. Maintenance hosts are the ones in which the pathogen persists and is transmitted regularly, providing a continuous source of infection that keeps the virus in circulation even between outbreaks. This long-term persistence is what keeps the virus present in the population over time, forming the backbone of the enzootic transmission cycle. Amplifying hosts mainly boost transmission during outbreaks, increasing case numbers but not necessarily ensuring ongoing presence year after year. Indicator hosts reveal that an infection is present but do not contribute to maintaining the virus. Reservoir hosts are sources of infection for others and can be involved in spillover, but the term maintenance specifically captures the aspect of enduring persistence within the host population itself.