[Characteristic of Listeria spp. bacteria isolated from food products].

The frequency of occurrance of Listeria strains in different food products was determined. Biochemical characteristic of the isolated strains was achieved in accordance with procedure included in PNEN ISO 11290 standard, genus was determined byApiListeria (bioMéieux) test. Sensitivity to selected antibacterial medicines was investigated using disck method and Mueller-Hinton 2 Agar medium.

[Sanitary evaluation of water taken from the water supply used by the inhabitants of Łódź].

The aim of the work was the microbiological evaluation of water taken from the popular water intakes used by the inhabitants in Łódź. The examination of water was performance directly after sampling, after 48 hours of the storage at temperature 0-4 degrees C and also after the storage at the room temperature. The microbiological examinations of water in the aspect of detection of majority of microbes were conducted using membrane filtration method.

[Drug resistant coagulase-positive staphylococci strains in food].

From the 1572 food samples, examined in Microbiology Department of Frozen Food Industry Research Laboratory in Lódź, 79 (5.0%) coagulase-positive staphylococci strains were isolated. All the strains were sensitive to vancomycin, gentamycin and chloramphenicol.

[Assessment of microbiological quality of minced meat designed for retail sale].

In the years 2000-2001 eighty nine portions (445 samples) of minced meat (beef and pork, beef, pork, veal, turkey) produced by supermarkets and other meat producers from Łódź and around Łódź were examined to check if they meet the standard requirements of PN-97/A-82009 and PN-97/A-82009/A1. The following parameters were determined according to PN-94/A-82055: the total number of microorganisms, most probable number of Escherichia coli, enumeration of Staphylococcus aureus and detection of Salmonella. In addition the presence of Listeria was determined in 25 g of examined meat.

[Occurrence of beta-lactamase types ESBL and AmpC among gram-negative rods isolated from food].

The aim of the study was to isolate extended spectrum beta-laktamases (ESBL) and chromosomal beta-laktamases AmpC producing strains from food products. A total of 739 Gram-negative bacteria were tested with double disc diffusion method using cefotaxim, ceftasidim and amoxycillin with clavulanic acid. One strain producing ESBL and belonging to Stenotrophomonas maltophilia was detected from the ice cream (0.