[Herd immunity and the role of Chlamydia pneumoniae in the etiology of respiratory diseases in the Czech Republic].

The objective of the investigation was to assess the seroprevalence of IgG in the population of the Czech Republic and to assess the etiological role of Chlamydia pneumoniae in respiratory diseases. The sera were examined by specific tests-genus by ELISA and species by the microimmunofluorescent test. The examination of sera from 1974-1975 for the serological survey was selected to make the results comparable with the results of examinations planned for 1996.

[Parvovirus B 19 in pregnancy].

The human parvovirus B 19 was discovered in 1975 by Cossart but its etiological association with erythema infectiosum and hydrops of the foetus was proved only in 1984-1985. The objective of the submitted prospective study was to assemble basic findings on the herd immunity of the female population and the risk of infection with this agent during pregnancy. Seropositivity of women of fertile age before the epidemic of parvovirus B 19 in 1993 and 1994 was cca 50%, after the epidemic 70%.

[Long-term follow-up of the etiology of diarrhea with emphasis on the role of rotaviruses in hospitalized patients at the Infectious Disease Clinic of the Medical School Hospital in Plzen].

During 1986-1994 the etiological structure of diarrhoea in hospitalized patients at the Infectious Diseases Clinic, University Hospital Plzen was analyzed. In children under four years most frequently (in 26%) rotaviruses were involved, in older patients their ratio was lower and the decisive pathogenetic organism were salmonellae. In rotavirus infections the shortest hospitalization period was recorded.

[Seroprevalence of IgG antibodies against parvovirus B19 in the population of the Czech Republic].

The human parvovirus B 19 was discovered in 1975 by Cossart in England. Later (1984) evidence was provided that this virus is the etiological agent of erythema infectiosum and hydrops foetalis, and in 1985 it was provided that it is also the etiological agent of some types of arthritis or arthropaties and vasculitis. The diagnosis of the disease caused by this agent is most frequently based on evidence of specific immunoglobulins.

[Tick-borne encephalitis in the West Bohemian Region 1960-1991].

In 1960-1991 in the West Bohemian region 746 cases of tick-borne encephalitis were confirmed by serological examination. The highest morbidity was recorded in the population of Plzen--5.9 per 100,000 per year.