The aim of our research was to verify hypothesis that clically healthy commercial carps are pathogen free. 45 clinically healthy trade carps of total body mass 900--1800 grams from nine different farms in Dolnośląskie province were examined in the time period from 28th November to 7th December 2009. For bacteriological tests samples of internal organs were taken. Quick 4-hour biochemical test RapID NF Plus System was used to identify isolated bacteria. In 42 cases samples were sterile (aseptic). In 3 other cases we have isolated following bacteria: Acinetobacter baumanii complex (with 99,83% probability), Burkholderia cepacia (with 99,99% probability). Antibiotic-resistance for isolated strains were also defined by using disc diffusion method. Isolated strains were found to be resistant to aminopenicillins. Isolated bacterial strains are untypical for fish and can be pathogenic for human.

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