Based on the classical model of SEIR infection, this paper studies infection with temporary duration immunity by increasing infectivity incubation period and after infection. differential equations, python language is used for modeling, modeling results are analyzed compared real data. The can preliminarily predict development trend influenza in a time conforming to above basic characteristics.

Background: Vitiligo is an acquired skin discoloration with melanocytic destruction. Vitiligo is associated with other autoimmune disorders; hence, an autoimmune etiology is among the most important theories for this disorder. The nails can be involved in numerous cutaneous or systemic non-cutaneous disorders. We have taken into consideration previous studies on nail abnormalities in vitiligo a...