Occurrence of caseous lymphadenitis in goats from a slaughterhouse in the Brazilian Northeast

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DOI:

https://doi.org/10.21708/avb.2023.17.4.11899

Resumo

Caseous lymphadenitis (CLA) is a chronic zoonosis that affects small ruminants globally. CLA is sometimes characterized by its visceral form, which may be associated with late diagnosis during postmortem inspection only. Alternatively, serological diagnosis could be used in the subclinical CLA cases detection due to its high sensitivity. Here, the occurrence of CLA in goats slaughtered in Mossoró, Rio Grande do Norte (RN) state, Brazil, was determined and indirect Enzyme Linked Immunosorbent Assay (ELISA) and microbiological culture methods were compared. Serum samples were collected from 150 goats and used to perform indirect ELISA using a supernatant of Corynebacterium pseudotuberculosis as an antigen. Goats were inspected after slaughter and fragments from internal organs suspicious of CLA were collected for microbiological culture. Indirect ELISA detected anti-C. pseudotuberculosis antibodies in 11.33% (17/150) of goats, while C. pseudotuberculosis was detected by microbiological culture in only 2% (3/150). The kappa index (κ = 0. 275) presented a weak agreement between ELISA and microbiological culture. In conclusion, despite the considerable proportion of CLA in goats from a slaughterhouse in Mossoró-RN, there was low detection of C. pseudotuberculosis in microbiological culture, denoting the higher sensitivity of ELISA. These facts could be associated with the long incubation period of C. pseudotuberculosis and the early seroconversion of goats infected.

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Biografia do Autor

Francisco Silvestre Brilhante Bezerra, Universidade Federal Rural do Semi-Árido - (UFERSA), Mossoró/RN

Mestrando do Programa de Pós-graduação em Ciência Animal da Universidade Federal Rural do Semi-árido - UFERSA.
Figure 1. The number of lesions and location of internal and external lesions compatible with caseous lymphadenitis in slaughtered goats. One goat had an external lesion compatible with caseous lymphadenitis but was not positive for caseous lymphadenitis in the microbiological analysis. Fifteen goats had internal lesions compatible with caseous lymphadenitis, and three of them had a positive result in the microbiological analysis. One of these lesions was in the liver and two in the lungs. Source: own authorship with Biorender.com.

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Publicado

2023-12-29

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