Singularity and Symmetry Analyses for Tuberculosis Epidemics
نویسندگان
چکیده
Tuberculosis (TB) is an airborne-transmitted disease and in human beings is caused by Mycobacterium tuberculosis bacteria (Mtb). Mtb droplets are released into the air by an infectious individual coughing and/or sneezing. Tubercle bacillus carried by such droplets live in the air for a short period of time [19] (about 2hours) and therefore it is believed that occasional contact with an infectious person rarely leads to infection. TB is described as a slow disease because of its long and variable latency period and its short and relatively narrow infectious period [19]. The initially exposed individuals (infected individuals) have a higher risk of developing active TB [3]. These individuals still face the possibility of progressing to infectious TB, but the rate of progression slows. In other words the likelihood of becoming an active infectious case decreases with the age of the infection. With this in mind several researchers constructed a series of dynamical models for TB progression and transmission in scenarios that took these factors into consideration [3, 4, 5].
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تاریخ انتشار 2014