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The terms "intrinsic incubation period" and "extrinsic incubation period" are used in vector-borne diseases. The intrinsic incubation period is the time taken by an organism to complete its development in the definitive host. The extrinsic incubation period is the time taken by an organism to develop in the intermediate host. [citation needed]
An epidemic curve, also known as an epi curve or epidemiological curve, is a statistical chart used in epidemiology to visualise the onset of a disease outbreak. It can help with the identification of the mode of transmission of the disease. It can also show the disease's magnitude, whether cases are clustered or if there are individual case ...
The relationship between the latent period, the infectious period (the period of communicability) and the incubation period. In some diseases, as depicted in this diagram, the latent period is shorter than the incubation period. A person can transmit an infection without showing any signs of the disease.
By convention, a communicable disease outbreak is declared over when a period of twice the incubation period of the infectious disease has elapsed without identification of any new case, however, for organisms with a short incubation period (e.g. fewer than ten days), a period of three times the incubation period is preferred. [11]
Incidence – rate of new cases of a disease occurring in a specific population within a defined time period, typically expressed per 1,000 or 100,000 individuals. Inequality in disease – disparities in the burden (distribution and impact) of infectious diseases among different population groups, often due to social determinants of health.
The first symptoms are fever and pain near the infection site, which occur after a one- to three-month incubation period. Furious rabies (the more common type) causes hyperactivity, hydrophobia, and aerophobia; death by cardio-respiratory arrest occurs within days. Paralytic rabies causes a slow progression from paralysis to coma to death. [73]
The serial interval in the epidemiology of communicable (infectious) diseases is the time between successive cases in a chain of transmission. [1]The serial interval is generally estimated from the interval between clinical onsets (if observable), in which case it is the 'clinical onset serial interval'.
The disease is usually more severe in adults than in children. [9] Chickenpox is an airborne disease which easily spreads via human-to-human transmission, typically through the coughs and sneezes of an infected person. [5] The incubation period is 10–21 days, after which the characteristic rash appears. [2]