Seroprevalence of Brucella ovis in rams and associated flock level risk factors in the state of Rio Grande do Sul, Brazil

G. Machado; D. V. Santos; I. Kohek; M. C. Stein; H. E. Hein; A. S. Poeta; A. C.M. Vidor; L. G. Corbellini

doi:10.1016/j.prevetmed.2015.05.009

Seroprevalence of Brucella ovis in rams and associated flock level risk factors in the state of Rio Grande do Sul, Brazil

G. Machado, D. V. Santos, I. Kohek, M. C. Stein, H. E. Hein, A. S. Poeta, A. C.M. Vidor, L. G. Corbellini

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10 Scopus citations

Abstract

A cross-sectional study based on a planned probabilistic sampling was carried out to estimate animal and flock prevalence of Brucella ovis in rams, as well as to determine risk factors at the flock level. Data regarding the flocks were collected by means of a questionnaire applied on 705 farms in the state of Rio Grande do Sul, Brazil, using one-stage cluster sampling. From the 705 flocks, 20 (2.5%, CI_95%: 2.0-3.1%) had at least one positive ram. At the animal level, out of 1800 rams, 52 were positive (2.89%, CI_95%: 0.4-5.3%). Statistical analysis identified the following as risk factors: average age of rams in the flocks (PR: 1.99, CI_95%: 1.19-3.32); farms larger than 5 km² (500ha) on extension area (PR: 7.46CI_95%: 2.03-27.43); and the lack of lambing paddocks (PR: 5.56, CI_95%: 1.70-18.11). This study provided relevant information for authorities to elaborate plans for the first Brazilian state based B. ovis disease control and eradication program. To the authors' knowledge, this is the first study that shows the importance of lambing paddocks in order to keep pre-lambing and lambing ewes away from the rest of the flock, the lack of this infrastructure was considered an important risk factor for B. ovis.

Original language	English (US)
Pages (from-to)	183-187
Number of pages	5
Journal	Preventive Veterinary Medicine
Volume	121
Issue number	1-2
DOIs	https://doi.org/10.1016/j.prevetmed.2015.05.009
State	Published - Sep 1 2015
Externally published	Yes

Bibliographical note

Funding Information:
Thanks to all 25 veterinarians and their 25 assistants. These collaborators belong to the SEAPA staff. We also thank veterinarians, Drs. Mauricio Dasso Gauterio, José Galdino and Roberto Azambuja. Part of this study was supported by Fundo de Desenvolvimento e Defesa Sanitária Animal (FUNDESA) .

Publisher Copyright:
© 2015 Elsevier B.V.

Keywords

Epididymitis
Lambing paddocks
Prevalence
Risk factor
Sheep

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title = "Seroprevalence of Brucella ovis in rams and associated flock level risk factors in the state of Rio Grande do Sul, Brazil",

abstract = "A cross-sectional study based on a planned probabilistic sampling was carried out to estimate animal and flock prevalence of Brucella ovis in rams, as well as to determine risk factors at the flock level. Data regarding the flocks were collected by means of a questionnaire applied on 705 farms in the state of Rio Grande do Sul, Brazil, using one-stage cluster sampling. From the 705 flocks, 20 (2.5%, CI95%: 2.0-3.1%) had at least one positive ram. At the animal level, out of 1800 rams, 52 were positive (2.89%, CI95%: 0.4-5.3%). Statistical analysis identified the following as risk factors: average age of rams in the flocks (PR: 1.99, CI95%: 1.19-3.32); farms larger than 5 km2 (500ha) on extension area (PR: 7.46CI95%: 2.03-27.43); and the lack of lambing paddocks (PR: 5.56, CI95%: 1.70-18.11). This study provided relevant information for authorities to elaborate plans for the first Brazilian state based B. ovis disease control and eradication program. To the authors' knowledge, this is the first study that shows the importance of lambing paddocks in order to keep pre-lambing and lambing ewes away from the rest of the flock, the lack of this infrastructure was considered an important risk factor for B. ovis.",

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author = "G. Machado and Santos, {D. V.} and I. Kohek and Stein, {M. C.} and Hein, {H. E.} and Poeta, {A. S.} and Vidor, {A. C.M.} and Corbellini, {L. G.}",

note = "Funding Information: Thanks to all 25 veterinarians and their 25 assistants. These collaborators belong to the SEAPA staff. We also thank veterinarians, Drs. Mauricio Dasso Gauterio, Jos{\'e} Galdino and Roberto Azambuja. Part of this study was supported by Fundo de Desenvolvimento e Defesa Sanit{\'a}ria Animal (FUNDESA) . Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

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AU - Hein, H. E.

AU - Poeta, A. S.

AU - Vidor, A. C.M.

AU - Corbellini, L. G.

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N2 - A cross-sectional study based on a planned probabilistic sampling was carried out to estimate animal and flock prevalence of Brucella ovis in rams, as well as to determine risk factors at the flock level. Data regarding the flocks were collected by means of a questionnaire applied on 705 farms in the state of Rio Grande do Sul, Brazil, using one-stage cluster sampling. From the 705 flocks, 20 (2.5%, CI95%: 2.0-3.1%) had at least one positive ram. At the animal level, out of 1800 rams, 52 were positive (2.89%, CI95%: 0.4-5.3%). Statistical analysis identified the following as risk factors: average age of rams in the flocks (PR: 1.99, CI95%: 1.19-3.32); farms larger than 5 km2 (500ha) on extension area (PR: 7.46CI95%: 2.03-27.43); and the lack of lambing paddocks (PR: 5.56, CI95%: 1.70-18.11). This study provided relevant information for authorities to elaborate plans for the first Brazilian state based B. ovis disease control and eradication program. To the authors' knowledge, this is the first study that shows the importance of lambing paddocks in order to keep pre-lambing and lambing ewes away from the rest of the flock, the lack of this infrastructure was considered an important risk factor for B. ovis.

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Seroprevalence of Brucella ovis in rams and associated flock level risk factors in the state of Rio Grande do Sul, Brazil

Abstract

Bibliographical note

Keywords

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