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. 2009 Oct;50(10):1039-46.

Longitudinal study of the distribution of Mycobacterium avium subsp. paratuberculosis in the environment of dairy herds in the Michigan Johne's disease control demonstration herd project

Roxanne B Pillars  1 , Daniel L Grooms, John B Kaneene
Affiliations

Longitudinal study of the distribution of Mycobacterium avium subsp. paratuberculosis in the environment of dairy herds in the Michigan Johne's disease control demonstration herd project

Roxanne B Pillars et al. Can Vet J. 2009 Oct.

Abstract
in English, French

The objective of this study was to describe the distribution of Mycobacterium avium subsp. paratuberculosis (MAP) in the environment of infected dairy farms over time. Johne's disease (JD) prevalence was monitored annually in 7 Michigan dairy herds. Environmental samples were collected bi-annually and cultured for MAP. Of 731 environmental samples that were cultured, 81 (11%) were positive. The lactating cow floor and manure storage areas were the areas most commonly contaminated, representing 30% and 33% of positive samples, respectively. When herd prevalence was > 2%, MAP was cultured from the lactating cow floor and/or manure storage area 75% of the time. When herd prevalence was < or = 2%, MAP was never cultured from samples collected. For every 1 unit increase in number of positive environmental samples, within herd JD prevalence increased 1.62%. Environmental contamination with MAP is consistent over time on infected dairy farms, and management practices to reduce environmental contamination are warranted.

Étude longitudinale de la distribution de Mycobacterium avium ssp. paratuberculosis dans l’environnement des troupeaux laitiers du projet de troupeau de démonstration pour le contrôle de la maladie de Johne au Michigan. Cette étude avait pour objectif de décrire la répartition dans le temps de Mycobacterium avium ssp. paratuberculosis (MAP) dans l’environnement des fermes laitières infectées. La prévalence de la maladie de Johne a été surveillée annuellement dans 7 troupeaux laitiers du Michigan. Des échantillons environnementaux ont été recueillis semestriellement et mis en culture pour détecter MAP. Parmi les 731 échantillons environnementaux mis en culture, 81 (11 %) étaient positifs. Le plancher des vaches en lactation et les aires d’entreposage du fumier étaient les endroits les plus communément contaminés, représentant 30 % et 33 % des échantillons positifs respectivement. Lorsque la prévalence au sein du troupeau était > 2 %, MAP a été mise en culture du plancher des vaches en lactation et/ou des aires d’entreposage du fumier dans 75 % des instances. Lorsque la prévalence au sein du troupeau était ≤ 2 %, MAP n’a jamais été mise en culture à partir des échantillons prélevés. Pour chaque augmentation d’une unité du nombre d’échantillons environnementaux positifs, la prévalence de la maladie de Johne a augmenté de 1,62 % au sein du troupeau. La contamination environnementale par MAP est stable au fil du temps dans les fermes laitières infectées et les pratiques de gestion pour réduire la contamination environnementale sont justifiées.

(Traduit par Isabelle Vallières)

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Figures

Figure 1
Figure 1
Percentage Mycobacterium avium subsp. paratuberculosis (MAP) positive environmental samples by within herd Johne’s disease prevalence.
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