[Epidemiologic studies of the prevalence of arterial hypertension among industrial workers in Stara Zagora]. / Epidemiologichni prouchvaniia vurkhu razprostranenieto na arterialnata khipertoniia pri promishleni rabotnitsi v Stara Zagora.

An epidemiologic study was carried out in June 1986 among 1702 industrial workers from the machine-building and metal-manufacturing industry--956 men and 746 women. 57.9% of the workers were in the 30-39 and 40-49 age groups. Arterial hypertension was found in 16.6% of the examined and borderline hypertension was found in 12.9%. With advancing age the hypertension frequency increases. Men suffer more frequently (18.4%) than women (14.2%). In younger age this difference is statistically significant. A relation was established between hypertension and obesity in both sexes. The characteristics of the hypertension structure and the relation of borderline hypertension with age, sex and body mass are discussed.

[Comparative study of various antigens of D. filaria by disc electrophoresis]. / Sravnitelno izsledvane na razlichni antigeni ot D. filaria chrez diskova elektroforeza

Somatic and functional antigens of Dictyocaulus filaria were comparatively studied by means of disk electrophoresis. Established were the protein fractions of the different antigens. The preliminary fractionation of the antigens on Sephadex G-200 made it possible (at a second concentration and separation through disk electrophoresis) to obtain fewer, but richer and better distinguishable fractions each one of which could be used alone as a specific antigen. The complement-fixation test, the indirect hemagglutination, and the latex agglutination reaction revealed that most specific and sensitive proved the antigen obtained after Stewart (II fraction), this method being more sensitive and specific, as compared with others. The c. f. test performed with this antigen gave consistently better results showing higher titers as against other antigens.