The period required for the development of a parasite or pathogen in a definitive host before the parasite or pathogen can be transmitted to or infect the intermediate host. For instance, the intrinsic incubation period for malaria in the human host is 7 to 30 days, varying with the type of malaria parasite. There is a prepatent period of about 6 to 16 days from the bite of an infected mosquito to appearance of the parasites in peripheral blood, then usually an additional period during which premonitory symptoms occur. There is a wide range of intrinsic incubation periods for parasitic infections with hemoflagellates, helminths, etc.
Subjects: Public Health and Epidemiology.