[Assessment of the epidemiological parameters of the most widespread viral diseases in the Socialist Republic of Romania and in Sibiu County for period 1967-1986]. / Estimation des paramètres épidémiologiques des viroses les plus répandues en R.S. de Roumanie et dans le département de Sibiu pour l'intervalle 1967-1986.

Essential peculiarities of the kinetics of the morbidity evolution of most frequent virus diseases were explained using a determinant mathematical model. The main epidemiological parameters for the whole territory of the S.R. of Romania and of Sibiu County were evaluated for the 1967-1986 period.

Computerized studies of influenza epidemiology in the Sibiu county between 1968 and 1986.

The report presents a statistical synthesis (a microcomputer Junior was used) concerning the incidence of various acute infections of the upper respiratory tract (AIURT), the stages of their evolution, the distribution of cases among the population groups, the seasonal incidence and the values of epidemiologic parameters. We used clinical and epidemiologic data on AIURT of viral etiology (especially influenza). The structure of a data base on the epidemiology of AIURT of viral etiology is also presented.

Stochastic model of the evolution of viral hepatitis morbidity.

Starting from the elementary epidemiological processes, the authors develop an evolution equation of the function generating the probability distribution of the number of viral hepatitis (VH) patients and susceptible subjects. Evolution equations for moments of order 1 and 2 - resulting from the equation of the generating function-are also discussed on the ground of certain simplifying hypotheses. The formulae are applied to the analysis of VH morbidity evolution in several children communities. The data on the evolution of the different moments and of the probability distributions are used from the specification of epidemiological transmissibility and susceptibility parameters.