Analysis of the correlation between the level of anti-Salmonella antibodies in egg yolks and the presence of these microorganisms in egg contents following experimental infection of hens with Salmonella Enteritidis and after treatment with selected antibiotics.

Serological tests applied in poultry flocks can be a valuable tool in assessing health of hens. One obstacle in making this assessment is that results of serological tests in a given flock are not always correlated with results of bacteriological tests. The aim of this study was to determine dependencies between the level of antibodies in egg yolk and the contamination of egg contents (whites and yolks) with Salmonella Enteritidis bacilli.

Occurrence of bacteria of the genus Staphylococcus in table eggs descended from different sources.

This paper presents the degree of contamination of table eggs with bacteria of the genus Staphylococcus, taking into account the source of the eggs. The results of the study indicate a relatively high degree of contamination of table eggs with Staphylococcus bacteria. In 1125 bacteriological tests conducted on whites, yolks and shells of eggs from three sources, staphylococci were found in 514 cases.

Influence of antibiotics on growth dynamics and movement ability of Salmonella rods.

Variety of traits important in diagnostics and epidemiology of pathogenic microorganisms may change due to antibiotics. Movement ability, that is characteristic for every serovar except from Salmonella Gallinarum-Pullorum, is important to salmonellas. In own experiments using semi-fluid MSRV medium, it was found that a decrease in salmonella sensibility to selected antibiotics and chemiotherapeutics due to passage might lead to weakening of its movement ability.

[Effect of Neowetadina and Polyvaccinum on serum levels of immunoglobulins and total proteins in calves during the industrial fattening process].

The usefulness of nonspecific stimulating preparations-Neowetadina (Biowet) and Poliwakcyna (Polfa) for stimulation of the serum level of immunoglobulins of the classes IgG, IgA and IgM and total protein was determined in calves of the black and white breed at the age of 9-10 weeks (average body weight 75-80 kg) over 8 weeks from the onset of industrial fattening in technological groups. The stimulants were given in single intramuscular injections at the following doses: 0.08 and 0.

[Effect of the number of lactation periods on the IgM level in the colostrum and peripheral blood serum of pregnant cows and calves].

The level of immunoglobulins of IgM class was determined in serum of peripheral blood of cows of the black-white breed, being after first, second and third lactation, in blood serum of calves in the period from birth to the 12th week of age as well as in beestings from the first milking. IgM level in serum and beestings was determined by redial immunodiffusion according to Mancini et al., as modified by Fahey and Mc Kelvey.

[The antibiotic sensitivity patterns of Salmonella pullorum and Salmonella gallinarum in in vitro studies].

The antibiotic sensitivity patterns of 100 strains of S. pullorum and 24 strains of S. gallinarum against 19 antibiotics and 3 antibiotic mixtures were determined by the broth dilution method.