Pathogenic <i>Leptospira</i> spp. Seroprevalence and Herd-Level Risk Factors Associated with Chilean Dairy Cattle

Leptospirosis is a ubiquitous distributed zoonotic infectious disease present in wild and domestic animals. This study aimed to estimate within-herd and herd-level seroprevalence against pathogenic <i>Leptospira</i> spp. in dairy cows from southern Chile and identify risk factors associa...

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Autores principales:	Victor Montes, Gustavo Monti
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	<i>Leptospira</i> within-herd seroprevalence herd-level prevalence risk factors dairy herds Veterinary medicine SF600-1100 Zoology QL1-991
Acceso en línea:	https://doaj.org/article/8a4238108e1349dc84741ea06d2a1853
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spelling	oai:doaj.org-article:8a4238108e1349dc84741ea06d2a18532021-11-25T16:17:06ZPathogenic <i>Leptospira</i> spp. Seroprevalence and Herd-Level Risk Factors Associated with Chilean Dairy Cattle10.3390/ani111131482076-2615https://doaj.org/article/8a4238108e1349dc84741ea06d2a18532021-11-01T00:00:00Zhttps://www.mdpi.com/2076-2615/11/11/3148https://doaj.org/toc/2076-2615Leptospirosis is a ubiquitous distributed zoonotic infectious disease present in wild and domestic animals. This study aimed to estimate within-herd and herd-level seroprevalence against pathogenic <i>Leptospira</i> spp. in dairy cows from southern Chile and identify risk factors associated with the herd-level status. We used a multi-stage strategy combined with a stratified sample strategy for randomly sampling 147 herds and 4876 lactating cows. We considered as infected a herd with at least one positive reactor to MAT. In addition, an epidemiological survey was applied to the herd’s owners and a logistic regression (LR) model was constructed to analyze it. The overall within-herd prevalence was 5.9% (95% CI 4.9–6.8), the overall herd-level prevalence was 42.2% (95% CI 9.2–47.9), and there was variation in both between different herd sizes. <i>L.</i> <i>borgpetersenii</i> serovars Hardjo and Tarassovi and <i>L. interrogans</i> serovar Pomona were the more frequent serovars in non-vaccinated herds. A factor that decreases the risk of a farm being infected was <i>Leptospira</i> vaccine usage (OR = 0.04; 95% CI = 0.02–0.11), and variables that increase risk were using bulls for mating (OR = 3.43; 95% CI = 1.1–10.1) and continuous calving distribution (OR = 3.4; 95% CI = 1.3–8.8). The study’s results will contribute to unravelling the infection burden in the main dairy area of the country and designing control strategies.Victor MontesGustavo MontiMDPI AGarticle<i>Leptospira</i>within-herd seroprevalenceherd-level prevalencerisk factorsdairy herdsVeterinary medicineSF600-1100ZoologyQL1-991ENAnimals, Vol 11, Iss 3148, p 3148 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	<i>Leptospira</i> within-herd seroprevalence herd-level prevalence risk factors dairy herds Veterinary medicine SF600-1100 Zoology QL1-991
spellingShingle	<i>Leptospira</i> within-herd seroprevalence herd-level prevalence risk factors dairy herds Veterinary medicine SF600-1100 Zoology QL1-991 Victor Montes Gustavo Monti Pathogenic <i>Leptospira</i> spp. Seroprevalence and Herd-Level Risk Factors Associated with Chilean Dairy Cattle
description	Leptospirosis is a ubiquitous distributed zoonotic infectious disease present in wild and domestic animals. This study aimed to estimate within-herd and herd-level seroprevalence against pathogenic <i>Leptospira</i> spp. in dairy cows from southern Chile and identify risk factors associated with the herd-level status. We used a multi-stage strategy combined with a stratified sample strategy for randomly sampling 147 herds and 4876 lactating cows. We considered as infected a herd with at least one positive reactor to MAT. In addition, an epidemiological survey was applied to the herd’s owners and a logistic regression (LR) model was constructed to analyze it. The overall within-herd prevalence was 5.9% (95% CI 4.9–6.8), the overall herd-level prevalence was 42.2% (95% CI 9.2–47.9), and there was variation in both between different herd sizes. <i>L.</i> <i>borgpetersenii</i> serovars Hardjo and Tarassovi and <i>L. interrogans</i> serovar Pomona were the more frequent serovars in non-vaccinated herds. A factor that decreases the risk of a farm being infected was <i>Leptospira</i> vaccine usage (OR = 0.04; 95% CI = 0.02–0.11), and variables that increase risk were using bulls for mating (OR = 3.43; 95% CI = 1.1–10.1) and continuous calving distribution (OR = 3.4; 95% CI = 1.3–8.8). The study’s results will contribute to unravelling the infection burden in the main dairy area of the country and designing control strategies.
format	article
author	Victor Montes Gustavo Monti
author_facet	Victor Montes Gustavo Monti
author_sort	Victor Montes
title	Pathogenic <i>Leptospira</i> spp. Seroprevalence and Herd-Level Risk Factors Associated with Chilean Dairy Cattle
title_short	Pathogenic <i>Leptospira</i> spp. Seroprevalence and Herd-Level Risk Factors Associated with Chilean Dairy Cattle
title_full	Pathogenic <i>Leptospira</i> spp. Seroprevalence and Herd-Level Risk Factors Associated with Chilean Dairy Cattle
title_fullStr	Pathogenic <i>Leptospira</i> spp. Seroprevalence and Herd-Level Risk Factors Associated with Chilean Dairy Cattle
title_full_unstemmed	Pathogenic <i>Leptospira</i> spp. Seroprevalence and Herd-Level Risk Factors Associated with Chilean Dairy Cattle
title_sort	pathogenic <i>leptospira</i> spp. seroprevalence and herd-level risk factors associated with chilean dairy cattle
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8a4238108e1349dc84741ea06d2a1853
work_keys_str_mv	AT victormontes pathogenicileptospiraisppseroprevalenceandherdlevelriskfactorsassociatedwithchileandairycattle AT gustavomonti pathogenicileptospiraisppseroprevalenceandherdlevelriskfactorsassociatedwithchileandairycattle
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Pathogenic <i>Leptospira</i> spp. Seroprevalence and Herd-Level Risk Factors Associated with Chilean Dairy Cattle

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