Biological properties of Estero Real virus.

The pathogenicity for animals, multiplication characteristics in animals, chick embryos and cells, and antibody formation to the Estero Real (ER) virus are reported.

Some diagnostic, biologic and morphologic characteristics of Francisella tularensis strains isolated from the ticks Ixodes ricinus (L.) in the Prague agglomeration.

Four infectious agents were isolated from the ticks Ixodes ricinus (L.) collected in the recreational area and park-forest of Prague. On the basis of cultivation, staining, biochemical, serologic properties, pathogenicity for animals and histological tests they were identified as Francisella tularensis with the following features: they are short, gram-negative rods of approximate dimensions of 0.

Ultrastructure of Taenia saginata oncospheres cultivated in artificial media.

Oncospheres of Taenia saginata cultivated in Leibovitz's medium on a cell monolayer from calf kidney developed up to 10th day of in vitro cultivation. Fine and often branched microvilli were observed on their surface. On day 5 of cultivation, the muscle system of hooks turned to a granular matter and on day 7 neither hooks nor their muscle system were found.