Rapid detection and enumeration of trh-carrying Vibrio parahaemolyticus with the alkaline phosphatase-labelled oligonucleotide probe.
An alkaline phosphatase (AP)-labelled oligonucleotide probe was developed to detect and enumerate trh(+)Vibrio parahaemolyticus in seafood. The probe was evaluated using 40 isolates of V. parahaemolyticus, 45 isolates of other vibrios and 55 non-vibrio isolates. The probe reacted specifically with V. parahaemolyticus possessing either the trh1 or trh2 variant of the trh gene and was found to be 100% specific for trh(+)V. parahaemolyticus. Using the trh probe, V. parahaemolyticus carrying trh gene was targeted in 34 seafood samples by direct plating and colony hybridization procedure. The trh(+)V. parahaemolyticus could be detected in five of 34 (14.7%) samples and the levels ranged from 5.0 x 10(2) to 3.4 x 10(3) cfu g(-1). Colonies of trh(+)V.parahaemolyticus were isolated from the five positive samples. Forty seafood samples were analysed for trh(+)V. parahaemolyticus by colony hybridization following enrichment in alkaline peptone water. 16 samples (40%) were positive for trh gene and trh(+)V. parahaemolyticus was isolated from 15 samples (37.5%). To assess the sensitivity of the trh probe, seafood homogenates spiked with known concentrations of trh-positive V. parahaemolyticus were plated and hybridized. Counts obtained using the probe were similar to those of inocula. The results suggest that the AP-labelled trh probe is useful for the detection and enumeration of trh(+)V. parahaemolyticus in seafood.
Raghunath
Pendru
P
Department of Fishery Microbiology, Karnataka Veterinary, Animal and Fisheries Sciences University, College of Fisheries, Mangalore-575 002, India.
Pradeep
Balakrishnan
B
Karunasagar
Indrani
I
Karunasagar
Iddya
I
D000469:Alkaline Phosphatase; D001426:Bacterial Proteins / Q000235:genetics*; D015169:Colony Count, Microbial / Q000379:methods*; D005798:Genes, Bacterial; D006460:Hemolysin Proteins / Q000235:genetics*; D015345:Oligonucleotide Probes; D017747:Seafood / Q000382:microbiology*; D014736:Vibrio parahaemolyticus / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification*
D001426:Bacterial Proteins; D006460:Hemolysin Proteins; D015345:Oligonucleotide Probes; C088609:thermostable direct hemolysin-related hemolysin protein, Vibrio parahaemolyticus; D000469:Alkaline Phosphatase