National control and eradication program of bovine tuberculosis in Chile

Max, Vanessa; Paredes, Luis; Rivera, Alejandro Bahena; Ternicier, Claudio

doi:10.1016/j.vetmic.2011.02.043

Cited by 19 publications

(19 citation statements)

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“…Since a targeted sampling strategy was used to maximize the likelihood of detecting MAP and M. bovis-infected cattle, the apparent individual prevalence for M. bovis established should not be taken as the situation of the area, since it is higher than what has previously been officially reported (Max et al 2011) and also higher than reported in most countries with a developed dairy industry, where bovine tuberculosis has reached very low levels (Michel et al 2010).…”

Section: Discussionmentioning

confidence: 99%

“…An important aspect is that M. bovis is considered a major zoonotic agent, associated with tuberculosis. In Chile, a bovine tuberculosis (bTb) eradication program is currently being undertaken, and the estimated herd and within-herd prevalence in the regions of southern Chile are 0.3 and 0.67 %, respectively (Max et al 2011). However, high rates of infection still remain in some areas.…”

Section: Introductionmentioning

confidence: 99%

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Risk factors for Mycobacterium avium subsp. paratuberculosis (MAP) and Mycobacterium bovis coinfection at individual animal level in southern Chile cattle populations

Steuer

Raffo

Monti

et al. 2015

Trop Anim Health Prod

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Mycobacterium avium subsp. paratuberculosis (MAP) causes a chronic intestinal infection mainly in domestic and wild ruminants and is transmitted primarily by the fecal-oral route. Mycobacterium bovis (M. bovis) produces a chronic infection principally of the respiratory system. It affects most domestic mammals, wild species, and humans and is spread via the respiratory or oral route. It is important to note that M. bovis is considered a major zoonotic agent. The term coinfection refers to the coexistence of two or more infectious agents in the same host. The goal of the present study was to assess management factors that may favor coinfection with MAP and M. bovis in cattle at an individual level. A cross-sectional study was conducted including 366 cattle from 11 herds. Diagnostic information for both pathogens and individual characteristics of the animals and management practices applied on them was collected from each herd. The results indicated a set of variables being more frequent in the coinfected group of animals and mainly related with biosecurity measures. This study provided regionally based data that may be used to design future control plans for both cattle infections in southern Chile.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Risk factors for Mycobacterium avium subsp. paratuberculosis (MAP) and Mycobacterium bovis coinfection at individual animal level in southern Chile cattle populations

Steuer

Raffo

Monti

et al. 2015

Trop Anim Health Prod

View full text Add to dashboard Cite

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“…The Chilean bTB eradication program divides the country into two different epidemiological areas, the 'Control Zone' in the North, containing 28% of the national cattle population, and the 'Eradication Zone' in the South containing 72% of the country's cattle (Max et al 2011). The most used diagnostic procedure in Chile for the bTB program -as in many countries throughout the world-is the single caudal fold test.…”

Section: Introductionmentioning

confidence: 99%

“…The current situation of the cattle M. bovis infection rate in southern Chile is rather low and the estimated herd and within-herd prevalence in this region are 0.3 and 0.67%, respectively (Max et al 2011). Under this epidemiological scenario, we aim to assess the performance of routinely used diagnostic tests to detect M. bovis infection in cattle populations with very low infection prevalence.…”

Section: Introductionmentioning

confidence: 99%

Comparison of common tests performance for Mycobacterium bovis infection diagnosis in low prevalence dairy cattle herds of southern Chile

Raffo

Monti

Salgado

2018

Austral j. vet. sci.

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ABSTRACT. The aim of the present study was to assess the performance of routinely used diagnostic tests to detect M. bovis infection in cattle populations with very low infection prevalence. A cross-sectional study was performed using 609 animals from 17 herds that were sampled for blood interferon, and tested with the caudal fold tuberculin test (CFT). It was planned that animals which showed CFT positive results were sent to the slaughterhouse for post mortem confirmation testing. However, not all the animals considered in the initial sampling were culled. Paired population proportions of positive results for the different diagnostic tools were compared. Apparent sensitivity and specificity was also estimated. Overall, intradermal tuberculin based diagnostics showed better performance in comparison to interferon based test, even though interferon was slightly more specific. From these results, it may be suggested that specific cut-off lines for interferon based techniques for certain areas with particular low bTB prevalence should be considered, as well as the modification of more specific antigens and the use of better combinations of PPDs if in vitro testing is intended must be taken into consideration. The uncertain role of interference bacteria that could be affecting the results of the in vitro analysis must be considered, and perhaps this could explain the apparent lack of consensus of the results obtained in Chile versus the ones obtained elsewhere. More studies must be performed in order to assess this issue.

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“…In the area where the hawk was found dead, a bovine tuberculosis eradication program is currently underway and under control. However, high rates of infection in some areas and in some medium sized to large herds still remain (Max et al 2011). All samples from the granuloma lesions with AFB in the affected tissue that were submitted to molecular confirmation resulted positive only for M. bovis and negative for Maa and M. genavense.…”

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confidence: 99%

Molecular evidence for Mycobacterium bovis infection in wild Chilean hawk (Accipiter chilensis)

Moroni

Salgado

Albornoz

et al. 2018

Austral j. vet. sci.

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ABSTRACT. The present study reports a case of tuberculosis in a juvenile Chilean hawk (Accipiter chilensis). Granulomas were identified in the liver, intestine and mesentery. Several of these granulomas contained acid-fast bacilli suggesting a mycobacterial infection through ingestion. Molecular diagnosis detected Mycobacterium bovis as etiological agent. Whether M. bovis infection in this Chilean hawk represents a risk for other wildlife, livestock or humans remains to be determined.

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National control and eradication program of bovine tuberculosis in Chile

Cited by 19 publications

References 0 publications

Risk factors for Mycobacterium avium subsp. paratuberculosis (MAP) and Mycobacterium bovis coinfection at individual animal level in southern Chile cattle populations

Risk factors for Mycobacterium avium subsp. paratuberculosis (MAP) and Mycobacterium bovis coinfection at individual animal level in southern Chile cattle populations

Comparison of common tests performance for Mycobacterium bovis infection diagnosis in low prevalence dairy cattle herds of southern Chile

Molecular evidence for Mycobacterium bovis infection in wild Chilean hawk (Accipiter chilensis)

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