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Brucellosis and chlamydiosis seroprevalence in goats at livestock-wildlife interface areas of Zimbabwe
2019
Bhandi, Solomon(University of Zimbabwe Faculty of Veterinary Science Department of Clinical Veterinary Studies,Research Platform Production and Conservation in Partnership) | Pfukenyi, Davies M.(University of Zimbabwe Faculty of Veterinary Science Department of Clinical Veterinary Studies,Research Platform Production and Conservation in Partnership) | Matope, Gift(Research Platform Production and Conservation in Partnership ,University of Zimbabwe Faculty of Veterinary Science Department of Paraclinical Veterinary Studies) | Murondoti, Absolom(University of Zimbabwe Faculty of Veterinary Science Department of Clinical Veterinary Studies) | Tivapasi, Musavengana(University of Zimbabwe Faculty of Veterinary Science Department of Clinical Veterinary Studies,Research Platform Production and Conservation in Partnership) | Ndengu, Masimba(University of Zimbabwe Faculty of Veterinary Science Department of Clinical Veterinary Studies,Research Platform Production and Conservation in Partnership) | Scacchia, Massimo(The Experimental Zooprophylactic Institute of Abruzzo and Molise) | Bonfini, Barbara(The Experimental Zooprophylactic Institute of Abruzzo and Molise) | de Garine-Wichatitsky, Michel(Research Platform Production and Conservation in Partnership ,Kasetsart University Faculty of Veterinary Medicine)
In Zimbabwe, there have been no chlamydiosis and limited brucellosis studies in goats. This study was conducted to determine the seroprevalence and risk factors of the two diseases in goats at three different livestock-wildlife interface areas: porous, non-porous and non-interface in the south-eastern lowveld of Zimbabwe. Collected sera (n = 563) were tested for Brucella antibodies using the Rose Bengal plate test (RBPT) and the complement fixation test (CFT); and for Chlamydia abortus antibodies using the CFT. All tested goats were negative for Brucella antibodies. Overall, chlamydial seroprevalence was 22%. The porous [c² = 9.6, odds ratio (OR) = 2.6, p = 0.002] and non-porous (c² = 37.5, OR = 5.8, p < 0.00001) interfaces were approximately three and six times more likely to be chlamydial seropositive than the non-interface area, respectively. Chlamydial seroprevalence was not associated with sex (c² = 0.5, OR = 1.2, p = 0.5), abortion history in female goats (c² = 0.7, OR = 1.3, p = 0.4), keeping goats with cattle (c² = 0.2, OR = 1.5, p = 0.7) or flock size (c² = 0.03, OR = 1.4, p = 0.9). Our study provides the first serological evidence of chlamydiosis in goats in Zimbabwe and the results suggest that proximity to wildlife is associated with increased chlamydial seropositivity. Further studies are required to determine the role of chlamydial infection on goat reproductive failure and that of wildlife on C. abortus transmission to domestic ruminants.
显示更多 [+] 显示较少 [-]Protective efficacy of an inactivated Brucella abortus vaccine candidate lysed by GI24 against brucellosis in Korean black goats
2019
Kim, W. K. | Moon, J. Y. | Cho, J. S. | Ochirkhuvaq, E. | Akanda, M. R. | Park, B. Y. | Hur, H.
The efficacy of GI24-lysed Brucella abortus cells as a vaccine candidate against brucellosis in goats was evaluated on 2 groups of Korean black goats. Group A goats were immunized subcutaneously (SC) with sterile phosphate-buffered saline, whereas group B goats were immunized SC with approximately 3 × 10(9) lysed B. abortus cells. Subcutaneous immunization with the lysed cells did not cause any negative impact on the overall clinical status, such as behavior and appetite, throughout the study period. The enzyme-linked immunosorbent assay (ELISA) optical densities values for B. abortus lipopolysaccharide in serum were considerably higher in group B than those in group A. Also, the levels of the cytokines interleukin 4 (IL-4), tumor necrosis factor-alpha (TNF-α), and interferon gamma (IFN-γ) were significantly elevated in group B compared with those in group A. Following intraconjunctival challenge with B. abortus strain 544, the severity of brucellosis in terms of infection index and colonization of B. abortus in tissues was significantly lower in group B than in group A. The present study concluded that 3 of 5 goats immunized with GI24-lysed bacteria were completely protected against challenge. Future investigations are required to improve the protective efficacy offered by lysed B. abortus cells for practical applications in small ruminants.
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