[The epidemic process in infections before and after active immunization. II. Changes in the number of susceptible individuals in the population during a natural epidemic and its control by active immunization].

Based on the long-term follow-up of the incidence of some infectious diseases in the district and calculations of the actual number of infected subjects, the authors present an estimate of the ratio of susceptible and immune subjects during the unimpaired epidemic process. The epidemic process develops from the lowest range of immune subjects and stops at the highest range. The highest range thus gives the ratio of immune subjects which must be achieved or maintained by active immunization to achieve elimination of a given infection.

[The epidemic process in infections before and after active immunization. I. Comparison of long-term monitoring of the disease with a simple mathematical model].

In the first part of this paper the authors used for demographic data and morbidity data concerning measles, parotitis, rubella and chickenpox in the Sokolov district a model of exponential distribution, in particular its distribution function. The authors introduced the concept of mean population year. They tested the theoretical assumption that in different infections in long-term average the annual number of infected subjects is equal and equals the mean population year.

[Nosocomial infections in surgical intensive care of multiple injuries].

The authors present an abridged version of the final report of a State research programme. By introduction of a series of provisions and expedient use of funds available for research it proved possible to reduce the incidence of nosocomial infections in surgical patients from 14% to 12% and in a group with multiple injuries in the surgical intensive care unit from 18% to 10%.

[The contribution of the virology laboratory to the diagnosis of neuroinfections].

The authors summarizes the results of a virological examination in 1231 patients with neuroinfections hospitalized in 1973-1984 at the Infectious Diseases Clinic in Plzen. The virological diagnosis contributed towards the elucidation of the aetiology in 62.4% of the patients.

[Incidence of zoonoses with their natural foci in the West Bohemia Region. II. Antibodies to the Tahyna and Tribec tick-borne encephalitis viruses].

The authors examined serum samples from 475 men from different districts of the West Bohemian region for the presence of antibodies against viruses of tick-borne encephalitis, Tahyna and Tribec, strain Lipovník. Antibodies against the virus of tick-borne encephalitis were found in 1.1% and antibodies against the Tahyna virus in 4.