Serum resistance as a good indicator for virulence in Aeromonas hydrophila strains isolated from diseased fish in South-East Asia |
| |
| Authors: | K. Y. LEUNG I. V. YEAP T. J. LAM Y. M. SIN |
| |
| Affiliation: | Department of Zoology, Faculty of Science, National University of Singapore, Singapore |
| |
| Abstract: | Abstract. Aeromonas hydrophila strains isolated from diseased fish in South-East Asia were studied for their virulence in naive tilapia, Oreochrommis aureus (Steindachner), and blue gourami, Trichogaster trichopterus (Pallas). Five of the most virulent strains used in this study shared a common resistance to the killing effect of naive fish serum. Other factors such as lack of autoagglutination in 0.2% acriflavine, instability after boiling, production of an S-layer, and proteases and haemolysins did not correlate well with virulence. In addition, serotyping could not group all the virulent strains. Therefore, serum resistance is considered as a good indicator for screening virulence of A. hydrophila strains isolated from diseased fish in South-East Asia. |
| |
| Keywords: | |
|
|
