[The characteristics of staphylococcal enterotoxins produced by strains isolated from mastitic cows, including epidemiological aspects].

Staphylococcal enterotoxins (SEs) are big heterogenic group of exotoxins, rather differential in respect of their nucleotide and amino-acid homology, as well as the location of their genes, molecular weight and iso-electric point value. SEs were identified in 1959 as the extra-cellular proteins produced by some Staphylococcus aureus strains. These enterotoxins are known as the pyrogenic toxins and this group contains also other staphylococcal toxins (staphylococcal toxic-shock syndrome toxin--TSST-1, A and B exfoliative toxins and streptococcal scarlet fever toxin).

[Using the PCR-RFLP method for comparative analysis of the pathogenic Escherichia coli strains].

The purpose of the study was to identify differences and similarities between Escherichia coli strains which do or do not utilize disaccharide sucrose by PCR-RFLP method. Investigations were done on chromosomal DNA level using cscA gene associated with conservative sequences. The cscA gene may be found in all of the analysed strains.

[Virulence of Yersinia pseudotuberculosis strains isolated from environment as a threat to human epidemic].

The purpose of the work has been to identify Yersinia pseudotuberculosis strains and to demonstrate their potential pathogenicity using PCR reaction. Investigations included 167 samples of the water and 32 samples of the soil from westpomeranian region. Based on the analysis of PCR reactions the research confirmed the presence of DNA Y.