Isolation and Characterisation of Dichelobacter Nodosus from Footrot Infected Sheep in Malaysia

Zakaria, Zunita (1998) Isolation and Characterisation of Dichelobacter Nodosus from Footrot Infected Sheep in Malaysia. Masters thesis, Universiti Putra Malaysia.

[img] PDF
1764Kb

Abstract

Twelve Dichelobacter nodosus were isolated from 12 sheep with footrot with lesion score 2. The isolates were studied and the results analysed. Diagnosis was done successfully by Gram-stain method while polymerase chain reaction (PCR) method with species specific primers, A and Ac were employed for species confirmation. All 12 isolates reacted positively in the peR method by producing a single product of approximately 780 basepairs. All isolates, although obtained from distant locations, were from serogroup B (10 isolates were B2 serotype, 2 isolates were B1 serotype). The E-test method was used to determine the minimum inhibition concentration (MIC) values of nine antimicrobial agents against all 12 isolates. Penicillin G proved to be the most effective antibiotic with MIC90% of 0.023 ug/ml. Two standard conventional methods, the elastase and gelatin gel tests, were used in assessing the virulence of the isolates. Generally, the isolates exhibited variation in the laboratory characteristics although they had been isolated from similar lesion score. Some of the isolates which appeared to have the capability of causing virulent footrot in-vitro, failed to show clinical signs of virulent form of footrot. This was probably due to the frequent topical regimen adhered to and result of the vaccination programme by the farm management. All isolates were found not to contain plasmid by standard plasmid extracting method. This indicates that the genes coding for virulence of the isolates were not plasmidmediated. Molecular typing of the isolates was successfully carried out by pulsed field gel electrophoresis (PFGE) analysis. Significant patterns were generated by three GC-rich enzymes (ApaI, SfiI and SmaI) discriminating the isolates into eight genome types. Isolates from the same flock were also shown to possess variation in their PFGE profiles. These results demonstrate the diversity of D. nodosus strains infecting sheep in Malaysia and also indicated that the isolates were from diverse sources.

Item Type:Thesis (Masters)
Subject:Footrot in sheep - Malaysia
Subject:Sheep - Infections - Malaysia
Chairman Supervisor:Professor Dato' Dr. Sheikh Omar Abdul Rahman
Call Number:FPV 1998 10
Faculty or Institute:Faculty of Veterinary Medicine
ID Code:12179
Deposited By: Nur Kamila Ramli
Deposited On:14 Jul 2011 08:51
Last Modified:28 Oct 2014 02:16

Repository Staff Only: Edit item detail

Document Download Statistics

This item has been downloaded for since 14 Jul 2011 08:51.

View statistics for "Isolation and Characterisation of Dichelobacter Nodosus from Footrot Infected Sheep in Malaysia "


Universiti Putra Malaysia Institutional Repository

Universiti Putra Malaysia Institutional Repository is an on-line digital archive that serves as a central collection and storage of scientific information and research at the Universiti Putra Malaysia.

Currently, the collections deposited in the IR consists of Master and PhD theses, Master and PhD Project Report, Journal Articles, Journal Bulletins, Conference Papers, UPM News, Newspaper Cuttings, Patents and Inaugural Lectures.

As the policy of the university does not permit users to view thesis in full text, access is only given to the first 24 pages only.