Epidemiology of bovine tuberculosis in Butajira, Southern Ethiopia: A cross-sectional abattoir-based study

Nemomsa, Biratu; Gebrezgabiher, Gebremedhin; Birhanu, Tadesse; Tadelle, Habtamu; Gebremedhin, Tadesse; Getachew, Belayneh

doi:10.5897/ajmr2013.6259

Cited by 11 publications

(12 citation statements)

References 22 publications

(22 reference statements)

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“…On the other hand, there was a statistically significant association ( p < 0.05) between lesion presence and BsS of slaughtered cattle. The infection occurred in medium (13.6%) as compared to good body condition animals (0.7%) which is in agreement with the findings by Biratu et al (2014) [ 37 ]. This could indicate the wasting nature of the disease and also that animals with good BCS have relatively good immunological response to the infectious agent compared to animals with medium BCS [ 4 ].…”

Section: Discussionsupporting

confidence: 91%

Evaluation of Postmortem Inspection Procedures to Diagnose Bovine Tuberculosis at Debre Birhan Municipal Abattoir

Woldemariyam

Markos

Shegu

et al. 2021

Animals

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Routine meat inspection in the abattoir was used to examine carcass for subsequent approval for consumption. However, the chance of missing lesions results in approval of carcass and/or the offal with lesions of tuberculosis. A cross-sectional study was conducted at Debre Birhan Municipal abattoir from October 2016 to May 2017. Lesion prevalence estimation and two meat inspection procedures’ efficacy evaluation was attempted. The breeds of the animals inspected were zebu breeds. Routine abattoir meat inspection involves visual inspection, palpation and incision of intact organs such as the liver and kidneys, as well as inspection, palpation and incision of tracheobronchial, mediastinal and prescapular lymph nodes. The detailed meat inspection involves inspection of each of the carcass. In this case, the seven lobes of the two lungs, lymph nodes and organs were also thoroughly examined. The cut surfaces were examined under bright light sources for the presence of an abscess, cheesy mass, and tubercles in detail. The study involved and compared both routine and detailed meat inspections at the abattoir. Chi-square test of independence and odds ratio were used to see the association of lesion and different risk factors. Based on detailed meat inspection, the overall lesion prevalence of bovine tuberculosis in the carcass of cattle slaughtered at Debre Birhan municipality abattoir was found to be 4.7% but only 0.5% of the carcass examined had detectable bovine tuberculosis lesions when routine abattoir meat inspection alone was used. The majority of the lesions were distributed to the lungs and associated lymph nodes. There was a significant association (p < 0.05) in TB infection rate and body condition score. In conclusion, this study has clearly indicated the prevalence of bovine tuberculosis lesions in the abattoir that are missed by routine abattoir meat inspection. In addition, it showed low sensitivity of the routine meat inspection procedure used. Hence, our study warrants immediate attention to strengthen the current meat inspection practices at Debre Birhan public abattoir.

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Section: Discussionsupporting

confidence: 91%

Evaluation of Postmortem Inspection Procedures to Diagnose Bovine Tuberculosis at Debre Birhan Municipal Abattoir

Woldemariyam

Markos

Shegu

et al. 2021

Animals

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“…Virtually all studies reviewed reported that the prevalence of bTB infection increased with age [23,27,34,[43][44][45][46][47][48]. The relationship between bTB infection and age is generally shown as monotonic or linear although a U-shaped relationship has also been reported [23,49].…”

Section: Agementioning

confidence: 99%

“…However, two Irish studies comparing animals with energy-restricted and unrestricted diets did not detect significant differences in bTB infection [56, 57]. Reports from Ethiopia are similarly mixed, with one study reporting a higher prevalence of bTB in animals with lower body condition scores [47] while another found no differences [44]. Future research needs to distinguish nutritional status/dietary factors and body condition from the immunological consequences of infection and the possible confounding effects of breed and other factors.…”

Section: Animal-level Risk Factorsmentioning

confidence: 99%

A review of risk factors for bovine tuberculosis infection in cattle in the UK and Ireland

et al. 2016

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Bovine tuberculosis (bTB) is an important disease of cattle caused by infection with Mycobacterium bovis, a pathogen that may be extremely difficult to eradicate in the presence of a true wildlife reservoir. Our objective was to identify and review relevant literature and provide a succinct summary of current knowledge of risk factors for transmission of infection of cattle. Search strings were developed to identify publications from electronic databases to February 2015. Abstracts of 4255 papers identified were reviewed by three reviewers to determine whether the entire article was likely to contain relevant information. Risk factors could be broadly grouped as follows: animal (including nutrition and genetics), herd (including bTB and testing history), environment, wildlife and social factors. Many risk factors are inter-related and study designs often do not enable differentiation between cause and consequence of infection. Despite differences in study design and location, some risk factors are consistently identified, e.g. herd size, bTB history, presence of infected wildlife, whereas the evidence for others is less consistent and coherent, e.g. nutrition, local cattle movements. We have identified knowledge gaps where further research may result in an improved understanding of bTB transmission dynamics. The application of targeted, multifactorial disease control regimens that address a range of risk factors simultaneously is likely to be a key to effective, evidence-informed control strategies.

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“…Another study investigating risk factors for bTB in cattle in Great Britain showed a positive association between atmospheric dryness and areas of high risk for M. bovis infection ( 46 ). Drought may impact rhinoceros body condition, with adverse consequences for immune responses ( 47 , 48 ), and susceptibility to TB ( 49 – 51 ). Alternatively, reduced availability of water sources during periods of drought could lead to greater congregation of animals at the limited available drinking or wallowing sites.…”

Section: Discussionmentioning

confidence: 99%

Epidemiology ofMycobacterium bovisinfection in free-ranging rhinoceros in Kruger National Park, South Africa

Dwyer

Goosen

Buss

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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Significance African rhinoceros survival is threatened by poaching, habitat loss, and climate effects. The presence of Mycobacterium bovis in wild populations creates an additional potential threat to health and conservation programs. This study reports a large survey of M. bovis infection in free-ranging rhinoceros. Our findings confirm a widespread, high infection burden in the rhinoceros population of Kruger National Park, South Africa and identify risk factors for infection. These findings provide a foundation for understanding the spread of bovine tuberculosis in complex ecosystems. This study reflects the complexity of investigating a multihost pathogen in a previously naïve system. It provides an opportunity to increase awareness of the global impact that tuberculosis can have on animal populations, food security, and conservation.

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Epidemiology of bovine tuberculosis in Butajira, Southern Ethiopia: A cross-sectional abattoir-based study

Cited by 11 publications

References 22 publications

Evaluation of Postmortem Inspection Procedures to Diagnose Bovine Tuberculosis at Debre Birhan Municipal Abattoir

Evaluation of Postmortem Inspection Procedures to Diagnose Bovine Tuberculosis at Debre Birhan Municipal Abattoir

A review of risk factors for bovine tuberculosis infection in cattle in the UK and Ireland

Epidemiology ofMycobacterium bovisinfection in free-ranging rhinoceros in Kruger National Park, South Africa

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