Risks of cattle babesiosis (Babesia bovis) outbreaks in a semi-arid region of Argentina
The epidemiology of Babesia bovis was studied in terms of enzootic stability/instability and husbandry and abiotic factors influencing B. bovis transmission rate in northeastern Santiago del Estero province, Argentina. The area is of limited suitability for its only vector in Argentina, the tick Rhipicephalus microplus. The proportion of calf herds in a state of enzootic stability/instability to B. bovis was determined and husbandry practices and abiotic factors associated with variations in B. bovis transmission rates were explored using a cross-sectional observational study design. Daily probability of infection (inoculation rate, h) with B. bovis was calculated from age-specific seroprevalence via ELISAi in 58 herds of 4.5–8.5-month-old calves. Herds were considered to be in enzootic instability (EI) when h < 0.005, and therefore inferred to be at risk of babesiosis outbreaks. Husbandry practices associated with differences in B. bovis transmission were analyzed using generalized linear models. Sixty-two percent of herds were found to be in an EI situation for B. bovis. Calves raised exclusively on permanent pastures –where higher cattle density is achieved– were exposed to higher B. bovis inoculation rates (h = 0.0063, 95% CI 0.0032-0.0123) than those reared under forage combinations (h = 0.0024, 95% CI 0.0011-0.0051) (P = 0.05). In addition, calves from herds located in the area of intermediate suitability for R. microplus development were more likely to become infected with B. bovis (h = 0.0067, 95% CI 0.0037-0.0121) than those reared in the ecologically unfavorable area for the vector (h = 0.0023, 95% CI 0.0010-0.0049) (P = 0.02). Neither the frequency of treatment with acaricides nor the use of long-acting acaricides to control R. microplus influenced the inoculation rate (P = 0.99 and P = 0.26, respectively). This result indicates that current R. microplus control schemes are not effective in reducing B. bovis transmission. Enzootic instability still prevails in the study area despite the drastic changes occurred in cattle production system. However, 38% of herds did reach enzootic stability; therefore, a specific epidemiological status cannot be assumed at a regional level. Yearly determination of the immunological status of each calf cohort is considered a proper approach to decision-making in vaccination against B. bovis.
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Format: | info:ar-repo/semantics/artículo biblioteca |
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Elsevier
2019-10
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Subjects: | Ganado Bovino, Enfermedades de los Animales, Babesia bovis, Babesiosis, Epidemia, Zona Semiárida, Argentina, Cattle, Animal Diseases, Epidemics, Semiarid Zones, |
Online Access: | https://www.sciencedirect.com/science/article/pii/S0167587718306901 http://hdl.handle.net/20.500.12123/5696 https://doi.org/10.1016/j.prevetmed.2019.104747 |
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oai:localhost:20.500.12123-56962019-08-27T11:55:11Z Risks of cattle babesiosis (Babesia bovis) outbreaks in a semi-arid region of Argentina Morel, Nicolas Mastropaolo, Mariano Torioni, Susana Marta Signorini, Marcelo Mangold, Atilio Jose Ganado Bovino Enfermedades de los Animales Babesia bovis Babesiosis Epidemia Zona Semiárida Argentina Cattle Animal Diseases Epidemics Semiarid Zones The epidemiology of Babesia bovis was studied in terms of enzootic stability/instability and husbandry and abiotic factors influencing B. bovis transmission rate in northeastern Santiago del Estero province, Argentina. The area is of limited suitability for its only vector in Argentina, the tick Rhipicephalus microplus. The proportion of calf herds in a state of enzootic stability/instability to B. bovis was determined and husbandry practices and abiotic factors associated with variations in B. bovis transmission rates were explored using a cross-sectional observational study design. Daily probability of infection (inoculation rate, h) with B. bovis was calculated from age-specific seroprevalence via ELISAi in 58 herds of 4.5–8.5-month-old calves. Herds were considered to be in enzootic instability (EI) when h < 0.005, and therefore inferred to be at risk of babesiosis outbreaks. Husbandry practices associated with differences in B. bovis transmission were analyzed using generalized linear models. Sixty-two percent of herds were found to be in an EI situation for B. bovis. Calves raised exclusively on permanent pastures –where higher cattle density is achieved– were exposed to higher B. bovis inoculation rates (h = 0.0063, 95% CI 0.0032-0.0123) than those reared under forage combinations (h = 0.0024, 95% CI 0.0011-0.0051) (P = 0.05). In addition, calves from herds located in the area of intermediate suitability for R. microplus development were more likely to become infected with B. bovis (h = 0.0067, 95% CI 0.0037-0.0121) than those reared in the ecologically unfavorable area for the vector (h = 0.0023, 95% CI 0.0010-0.0049) (P = 0.02). Neither the frequency of treatment with acaricides nor the use of long-acting acaricides to control R. microplus influenced the inoculation rate (P = 0.99 and P = 0.26, respectively). This result indicates that current R. microplus control schemes are not effective in reducing B. bovis transmission. Enzootic instability still prevails in the study area despite the drastic changes occurred in cattle production system. However, 38% of herds did reach enzootic stability; therefore, a specific epidemiological status cannot be assumed at a regional level. Yearly determination of the immunological status of each calf cohort is considered a proper approach to decision-making in vaccination against B. bovis. EEA Rafaela Fil: Morel, Nicolas. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina Fil: Mastropaolo, Mariano. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Cátedra de Parasitología y Enfermedades Parasitarias; Argentina Fil: Torioni, Susana Marta. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina Fil: Signorini, Marcelo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Mangold, Atilio Jose. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina 2019-08-27T11:53:33Z 2019-08-27T11:53:33Z 2019-10 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://www.sciencedirect.com/science/article/pii/S0167587718306901 http://hdl.handle.net/20.500.12123/5696 0167-5877 1873-1716 https://doi.org/10.1016/j.prevetmed.2019.104747 eng info:eu-repo/semantics/restrictedAccess application/pdf Elsevier Preventive Veterinary Medicine 170 : 104747 (October 2019) |
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Ganado Bovino Enfermedades de los Animales Babesia bovis Babesiosis Epidemia Zona Semiárida Argentina Cattle Animal Diseases Epidemics Semiarid Zones Ganado Bovino Enfermedades de los Animales Babesia bovis Babesiosis Epidemia Zona Semiárida Argentina Cattle Animal Diseases Epidemics Semiarid Zones |
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Ganado Bovino Enfermedades de los Animales Babesia bovis Babesiosis Epidemia Zona Semiárida Argentina Cattle Animal Diseases Epidemics Semiarid Zones Ganado Bovino Enfermedades de los Animales Babesia bovis Babesiosis Epidemia Zona Semiárida Argentina Cattle Animal Diseases Epidemics Semiarid Zones Morel, Nicolas Mastropaolo, Mariano Torioni, Susana Marta Signorini, Marcelo Mangold, Atilio Jose Risks of cattle babesiosis (Babesia bovis) outbreaks in a semi-arid region of Argentina |
description |
The epidemiology of Babesia bovis was studied in terms of enzootic stability/instability and husbandry and abiotic factors influencing B. bovis transmission rate in northeastern Santiago del Estero province, Argentina. The area is of limited suitability for its only vector in Argentina, the tick Rhipicephalus microplus. The proportion of calf herds in a state of enzootic stability/instability to B. bovis was determined and husbandry practices and abiotic factors associated with variations in B. bovis transmission rates were explored using a cross-sectional observational study design. Daily probability of infection (inoculation rate, h) with B. bovis was calculated from age-specific seroprevalence via ELISAi in 58 herds of 4.5–8.5-month-old calves. Herds were considered to be in enzootic instability (EI) when h < 0.005, and therefore inferred to be at risk of babesiosis outbreaks. Husbandry practices associated with differences in B. bovis transmission were analyzed using generalized linear models. Sixty-two percent of herds were found to be in an EI situation for B. bovis. Calves raised exclusively on permanent pastures –where higher cattle density is achieved– were exposed to higher B. bovis inoculation rates (h = 0.0063, 95% CI 0.0032-0.0123) than those reared under forage combinations (h = 0.0024, 95% CI 0.0011-0.0051) (P = 0.05). In addition, calves from herds located in the area of intermediate suitability for R. microplus development were more likely to become infected with B. bovis (h = 0.0067, 95% CI 0.0037-0.0121) than those reared in the ecologically unfavorable area for the vector (h = 0.0023, 95% CI 0.0010-0.0049) (P = 0.02). Neither the frequency of treatment with acaricides nor the use of long-acting acaricides to control R. microplus influenced the inoculation rate (P = 0.99 and P = 0.26, respectively). This result indicates that current R. microplus control schemes are not effective in reducing B. bovis transmission. Enzootic instability still prevails in the study area despite the drastic changes occurred in cattle production system. However, 38% of herds did reach enzootic stability; therefore, a specific epidemiological status cannot be assumed at a regional level. Yearly determination of the immunological status of each calf cohort is considered a proper approach to decision-making in vaccination against B. bovis. |
format |
info:ar-repo/semantics/artículo |
topic_facet |
Ganado Bovino Enfermedades de los Animales Babesia bovis Babesiosis Epidemia Zona Semiárida Argentina Cattle Animal Diseases Epidemics Semiarid Zones |
author |
Morel, Nicolas Mastropaolo, Mariano Torioni, Susana Marta Signorini, Marcelo Mangold, Atilio Jose |
author_facet |
Morel, Nicolas Mastropaolo, Mariano Torioni, Susana Marta Signorini, Marcelo Mangold, Atilio Jose |
author_sort |
Morel, Nicolas |
title |
Risks of cattle babesiosis (Babesia bovis) outbreaks in a semi-arid region of Argentina |
title_short |
Risks of cattle babesiosis (Babesia bovis) outbreaks in a semi-arid region of Argentina |
title_full |
Risks of cattle babesiosis (Babesia bovis) outbreaks in a semi-arid region of Argentina |
title_fullStr |
Risks of cattle babesiosis (Babesia bovis) outbreaks in a semi-arid region of Argentina |
title_full_unstemmed |
Risks of cattle babesiosis (Babesia bovis) outbreaks in a semi-arid region of Argentina |
title_sort |
risks of cattle babesiosis (babesia bovis) outbreaks in a semi-arid region of argentina |
publisher |
Elsevier |
publishDate |
2019-10 |
url |
https://www.sciencedirect.com/science/article/pii/S0167587718306901 http://hdl.handle.net/20.500.12123/5696 https://doi.org/10.1016/j.prevetmed.2019.104747 |
work_keys_str_mv |
AT morelnicolas risksofcattlebabesiosisbabesiabovisoutbreaksinasemiaridregionofargentina AT mastropaolomariano risksofcattlebabesiosisbabesiabovisoutbreaksinasemiaridregionofargentina AT torionisusanamarta risksofcattlebabesiosisbabesiabovisoutbreaksinasemiaridregionofargentina AT signorinimarcelo risksofcattlebabesiosisbabesiabovisoutbreaksinasemiaridregionofargentina AT mangoldatiliojose risksofcattlebabesiosisbabesiabovisoutbreaksinasemiaridregionofargentina |
_version_ |
1756007550310940672 |