Population Dependency of Measles, Syphilis and Amebiasis in Japan and Community Evolution.

Population Dependency of Measles, Syphilis and Amebiasis in Japan and Community Evolution. Jpn J Infect Dis. 2016 Oct 31; Authors: Yoshikura H, Takeuchi F Abstract Population size dependency of measles, syphilis and amebiasis was expressed as P = kN(m), where P, N and m were respectively number of patients, population size and a constant (~2 for measles and 1.3~1.4 for syphilis and amebiases). The population size dependency emerged only when conditions other than the population size, such as, infant mortality, hygienic condition, vaccination practices, etc., were improved to the same level in all the prefectures in Japan. Formation of prefectures and municipalities was well simulated by the random coin toss assuming that people are attracted to a community with a probability proportional to the number of the residents to the 1.3(th) power. When the number of inflow population was plotted against the number of the resident population in a prefecture, or when the number of coins added in a round was plotted against the number of coins present before the coin toss, the plots fell on a straight line with the slope ~1.3, which was almost the same as the slope obtained when the number of syphilis or amebiasis cases was plotted against the population size. PMID: 27795472 [PubMed - as supplied by publisher]
Source: Japanese Journal of Infectious Diseases - Category: Infectious Diseases Authors: Tags: Jpn J Infect Dis Source Type: research