Infection - The entry, establishment, and replication of pathogens inside a host organism.⏎
Mucous Membrane - The moist linings of body passages and internal cavities involved with absorption and secretion of substances.⏎
Host - An organism that harbors a parasite or another organism where there is a symbiotic relationship between the two organisms. In some cases, the relationship is commensal, or mutually beneficial, but in the case of a parasite and host, the host may be hurt by the parasite's presence.⏎
Habitat - The specific geographical area or physical environment that is inhabited by an organism or a population of organisms.⏎