Total happening «en masse» is important to epidemiologist - and so it is «massive manifestation of natural system of the sickness» (PSB). Manifestation "en masse" of the natural system of parotitis N makes quantities of qualities N , N , B b N , N , N etc. a) «Causative connection» (UV) is the reason of sickness appearance. UV has its own causes of appearance, Z neB z and so the hierarchy of cause in the complex happening from subsystem. Nongenotopic or/and entropic causes of appearance of causative bonds (connections) as equilibrium connects and/or separates binary elements of causative bond  (connection). Pathogenic of contagium exists virtually in happening «en masse» in pre pathogenesis, prior to forming «immanent UV». b) Realising conjunction between the subsystems makes appearance of «immanent causative connection». That is a moment from which comes to obligatory demonstration of pathogenic as inner cause of contagium and consequent getting sick. The author concludes that «natural work» is the cause by which UV appears. Natural work is outer cause of massiveness. Just by appearance of "immanent UV" the showing of contagium pathogenic in the subsystem of sickness. The pathogenic of contagium can be proved by artificial experiment and that way the Henle-Koch postulates can be satisfied, It happens that way that input disturbance unable to be shown. Finally, anyway natural happening should pass judgement on authenticity of the theory on natural happening. 

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