title: Epidemiological, bacteriological and molecular studies on caseous lymphadenitis in Sirohi goats of Rajasthan, India.
abstract: Corynebacterium pseudotuberculosis is the causative agent of caseous lymphadenitis (CL), a chronic debilitating disease of goats. In the present study, a total of 575 goats of Sirohi breed on an organized farm situated in the semi-arid tropical region of Rajasthan, India were clinically examined. Pus samples from superficial lymph nodes of 27 (4.7%) adult goats presenting clinical lesions suggestive of CL were collected for bacteriological and molecular analyses. Of these goats, 51.9% yielded C. pseudotuberculosis on the basis of morphological, cultural and biochemical characteristics. A polymerase chain reaction (PCR) assay targeting proline iminopeptidase gene specific to C. pseudotuberculosis was developed that confirmed all 14 bacterial isolates. The specificity of the PCR product was confirmed by sequencing of the 551-bp amplicon in both senses, showing 98-100% homology with published sequences. Thus, overall prevalence rate based on clinical, bacterial culture and PCR assay were found to be 4.7%, 2.4% and 2.4%, respectively. The PCR assay developed in this study was found to be specific and rapid, and could be used for confirmation of CL in goats as an alternative method to generally cumbersome, time-consuming and less reliable conventional methods.
authors.affiliation: Division of Animal Health, Central Sheep and Wool Research Institute, Avikanagar, 304501, India.
authors.forename: Jyoti
authors.initials: J
authors.lastname: Kumar
authors.forename: Fateh
authors.initials: F
authors.lastname: Singh
authors.forename: Bhupendra Nath
authors.initials: BN
authors.lastname: Tripathi
authors.forename: Rajiv
authors.initials: R
authors.lastname: Kumar
authors.forename: Shivendra Kumar
authors.initials: SK
authors.lastname: Dixit
authors.forename: Ganesh Gangaram
authors.initials: GG
authors.lastname: Sonawane
mesh_terms: D000626:Aminopeptidases / Q000235:genetics; D000818:Animals; D003354:Corynebacterium Infections / Q000453:epidemiology / Q000382:microbiology / Q000473:pathology / Q000662:veterinary*; D016925:Corynebacterium pseudotuberculosis / Q000235:genetics* / Q000302:isolation & purification; D015511:Goat Diseases / Q000453:epidemiology / Q000382:microbiology* / Q000473:pathology; D006041:Goats; D007194:India / Q000453:epidemiology; D008198:Lymph Nodes / Q000382:microbiology / Q000473:pathology; D008199:Lymphadenitis / Q000453:epidemiology / Q000382:microbiology / Q000473:pathology / Q000662:veterinary*; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction / Q000662:veterinary; D015995:Prevalence; D017422:Sequence Analysis, DNA; D017385:Sequence Homology; D013492:Suppuration / Q000453:epidemiology / Q000382:microbiology / Q000473:pathology / Q000662:veterinary
chemical_list: D000626:Aminopeptidases; C022450:prolyl aminopeptidase