Isolation, serological and molecular methods in screening of Burkholderia mallei in East Azerbaijan province, Iran

Document Type : Original Article

Authors

1 Department of Biology, Faculty of Basic Sciences, Islamic Azad University, Zanjan Branch, Zanjan, Iran

2 Department of Livestock Bacterial Diseases Research, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization, Karaj, Iran

3 Reference Laboratory of Bovine Tuberculosis, Razi Vaccine and Serum Research Institute, Agricultural Research Education and Extension Organization, Karaj, Iran

4 Infectious and Tropical Diseases Research Centre, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran

Abstract
Glanders caused by Burkholderia mallei is one of the most dangerous zoonotic diseases in solipeds. Clinical diagnosis of this disease in its early stages in horses, is difficult. This study investigated serological and molecular identification of B. mallei in East Azerbaijan province. In the third and fourth quarters of 2020, throughout 2021, and in the first and second quarters of 2022, the complement fixation test (CFT) was performed on 350 horses. The malleination was used to confirm the positive CFT cases. Blood samples were taken for culture and for preparing serums to perform the enzyme-linked immunosorbent assay (ELISA). Deep eye discharge, nostril, cutaneous ulcers and lymph fluid swabs were cultured, and polymerase chain reaction (PCR) was carried out. Eleven horses were CFT-positive. Based on the malleination on the 11 horses, six were affected by glanders, five were not affected (false positive), and one horse was CFT-negative despite exhibiting clinical signs. It was positive by malleination, ELISA and PCR. A total number of seven positive cases of glanders were diagnosed. The B. mallei could not be isolated, but the Burkholderia cepacia complex was isolated in one case. Except for three cases, the results of the CFT, mallein and ELISA tests were consistent. The amount of confidence interval was 95.00%. It is suggested that ELISA could be used as a complement to CFT in screening and, if positive results are observed in one of the tests, the entire herd must be examined more accurately using the mallein and western blot confirmatory tests.

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Volume 15, Issue 5
May 2024
Pages 231-236

  • Receive Date 02 September 2023
  • Revise Date 03 December 2023
  • Accept Date 08 January 2024