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Epizootiology, pathogenicity and haemato-immunology associated withStreptococcus agalactiae serotype Ib infection in climbing perch(Anabas testudineus) |
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| รหัสดีโอไอ | |
| Creator | 1. Chutima Klingklib 2. Naraid Suanyuk 3. Tharanan Kongkapan 4. Chutima Tantikitti |
| Title | Epizootiology, pathogenicity and haemato-immunology associated withStreptococcus agalactiae serotype Ib infection in climbing perch(Anabas testudineus) |
| Publisher | Research and Development Office, Prince of Songkla University |
| Publication Year | 2564 |
| Journal Title | Songklanakarin Journal of Science and Technology (SJST) |
| Journal Vol. | 43 |
| Journal No. | 4 |
| Page no. | 1212-1219 |
| Keyword | climbing perch, Streptococcus agalactiae, epizootiology, pathogenicity, immunology |
| URL Website | https://rdo.psu.ac.th/sjstweb/index.php |
| ISSN | 0125-3395 |
| Abstract | The present study report on epizootiology, pathogenicity and haemato-immunological aspects of Streptococcusagalactiae (Group B Streptococcus, GBS) serotype Ib (GBS-Ib) affecting climbing perch (Anabas testudineus) in southernThailand. Study on growth of GBS-Ib under various conditions indicated that this bacterium grew from 25 to 35?C, pH 5 to 9 and0.5 to 4.0% NaCl. Climbing perch inoculated by intraperitoneally injected GBS-Ib at concentrations of 101to 104 CFU/mLexhibited 60.00-96.67% mortality, with 60 h-LD50 and 72 h-LD50 at 4.5x102 CFU/mL and 6.3x101 CFU/mL inoculums,respectively. Study of the haemato-immunological changes in the fish infected with GBS-Ib revealed declines of haematocrit,haemoglobin, serum protein, red blood cells, and respiratory burst activity. On the other hand, white blood cells, lysozymeactivity, phagocytic index, and average beads per cell, were significantly increased in the infected fish. Study on the effect ofenvironmental factors on the susceptibility of fish to GBS-Ib infection indicated that high water temperature and low dissolvedoxygen levels proved to increase mortality of climbing perch. These findings indicate that GBS-Ib is a pathogenic bacteriumresponsible for fish mortality in Thailand. |
