Consideraciones epidemiológicas en la prevalencia serológica de Brucella ovis en Zacatecas, México Possible risk factors for serological prevalence of Brucella ovis in Zacatecas, Mexico (original) (raw)
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2002
With the purpose of determining the prevalence of bovine brucellosis, as well as identifying some factors associated to this disease, a cross sectional study was carried out in dairy farms at Tijuana, Baja California, from September 1999 to September 2000. A total of 19,000 dairy cows aged 6 months or over, were studied. The tests used to detect this disease were the Card test and Fluorescence Polarization Assay (FPA). An epidemiological survey was applied in order to identify risk factors for brucellosis. Prevalence according to FPA was 6.4 %. When an univariate analysis was performed, the variables that showed a significant association with the disease were: not removing the remains of abortions and/or births (2.40 odds ratios (OR), presence of dogs in the facilities (OR= 2.65), milking positive reactors before or together with negative animals (OR= 6.74) and not getting rid of positive reactors (OR= 6.19). On the other hand, when a multivariate method was used (logistic regressio...
Consideraciones epidemiológicas en la prevalencia serológica de Brucella ovis en Zacatecas, México
Revista Mexicana de Ciencias Pecuarias
Epididymitis due to Brucella ovis infection lead to a disease with great importance in Mexican sheep industry. In the affected rams produces a low productivity due to a decreased fertility. The objective of the study was to determine the relevance of different possible risk factors (production system, density of sires, population of ewes, ewes:ram ratio, mating system and sires breed) upon B. ovis prevalence in Zacatecas, México. A sample of 544 rams was obtained in 153 flocks from four production systems. The serological test was determined by double immunodiffusion. The positive sampled rams were 18.6 % (101/544) and 10.5 % (16/153) of the sampled flocks had at least one positive ram. The semi-intensive production system showed a major prevalence (P<0.05) with 86.1 % (87/101) of the positive rams, the extensive system with 11.9 % (12/101), the backyard with 2.0 % (2/101) and the intensive did not register positives. The prevalence of B. ovis was higher in larger flocks, with th...
Seroepidemiology of sheep brucellosis in the microregion of Feira de Santana, BA, Brazil
Brazilian Journal of Veterinary Research and Animal Science, 2013
The aim of the present study was to perform a seroepidemiological survey of Brucella ovis in ovine flocks in the microregion of Feira de Santana, State of Bahia (BA), Brazil. Ten municipalities with the largest sheep flocks were selected for this survey: Antonio Cardoso, Feira de Santana, Ipecaetá, Ipirá, Itatim, Pintadas, Rafael Jambeiro, Santa Teresinha, Santo Estévão and Serra Preta. The sample size was established on the basis of three parameters: significance level (99%), sampling error (5%), and estimated prevalence (50%). The total sample was divided proportionally to the sheep population found in the respective municipalities. The flocks examined in each municipality were randomly selected. The animals were older than six months and were distributed among 49 properties in the municipalities. Samples of blood from 793 male and female sheep were analyzed. During visitations, an epidemiological questionnaire was applied for collection of information and analysis of possible risk factors. All sera samples were analyzed by agar gel immunodiffusion (AGID) and the antigen was a mixture of soluble proteins and lipopolysaccharides from B. ovis (strain Reo 198). Seropositive animals (6.94%, 55/793) to B. ovis were detected. However, significant statistical difference (p>0.05) was not found for age and sex. Risk factors that might be associated with cases of seropositive animals for the variables analyzed were not found. In 61.22% (30/49) of the examined farms at least one seropositive animal was detected. Only two of the ten municipalities above had no seropositive animal.
Cadernos de Saúde Pública, 2013
El objetivo fue determinar la seroprevalencia a Brucella canis en perros y humanos convivientes en criaderos caninos y explorar los factores de riesgo asociados a la seropositividad. Se tomaron 20 criaderos, en los cuales se realizó diagnóstico serológico por PARP-2ME de 428 caninos y 91 humanos. Se aplicó una encuesta para determinar los factores de riesgo y se analizaron los datos mediante regresión logística. Se determinó una seroprevalencia de 15% en caninos y 9% en humanos convivientes. Se determinaron como factores asociados a la seropositividad canina el historial de seropositividad canina, conservar los caninos seropositivos, historial de aborto, higiene y protección del operario deficientes durante el servicio reproductivo, y procedimiento inseguro durante la atención de abortos. Como factores protectores se establecieron la ubicación rural de los criaderos, facilidad de aseo de los caniles, PARP-2ME premonta, y procedimiento seguro durante la atención de partos. En humanos...
Consideraciones B ovis Zacatecas, Mexico
PREVALENCIA SEROLÓGICA DE Brucella ovis EN ZACATECAS, MÉXICO Rev Mex Cienc Pecu 2013;4(1):61-74 Consideraciones epidemiológicas en la prevalencia serológica de Brucella ovis en Zacatecas, México Possible risk factors for serological prevalence of Brucella ovis in Zacatecas, Mexico RESUMEN La epididimitis causada por Brucella ovis es una enfermedad de importancia en los rebaños ovinos de México. En los sementales afectados ocasiona baja productividad por la disminución de la fertilidad. El objetivo del estudio fue determinar la relevancia de diferentes posibles factores de riesgo (sistema de producción, densidad de sementales, total de vientres, relación hembras:macho, sistema de empadre y raza del semental) sobre la prevalencia de B. ovis en Zacatecas, México. Se muestrearon 544 sementales, en 153 rebaños, provenientes de cuatro sistemas de producción. La respuesta serológica se evaluó mediante inmunodifusión doble en gel. El 18.6 % (101/544) de los sementales muestreados resultaron positivos y el 10.5 % (16/153) de los rebaños presentó al menos un semental positivo. El sistema semi-intensivo presentó la mayor prevalencia (P<0.05), con 86.1 % (87/101) de sementales positivos, el extensivo 11.9 % (12/101), el traspatio 2.0 % (2/101), y el intensivo no registró positivos. La prevalencia de B. ovis fue más alta en los rebaños más grandes, con mayor número de vientres y sementales. Los sementales de raza Katahdin mostraron mayor prevalencia (30.8 %) (24/78) que los Rambouillet (14.0 %) (18/129), Dorper (13.8 %) (31/224) y Suffolk (13.8 %) (8/58) (P<0.05). La prevalencia se relacionó más con el sistema de producción utilizado que con la relación hembras:macho o el sistema de empadre. Los resultados obtenidos sugieren que la cantidad de sementales en el rebaño es el factor de mayor relevancia en la prevalencia serológica de B. ovis (OR = 17.38, 95 % IC 7.76 a 38.94), aunque pudiera estar supeditado al sistema de producción. PALABRAS CLAVE: Brucella ovis, Prevalencia, Tamaño de rebaño, Sistema de producción, Empadre, Razas. ABSTRACT Epididymitis due to Brucella ovis infection lead to a disease with great importance in Mexican sheep industry. In the affected rams produces a low productivity due to a decreased fertility. The objective of the study was to determine the relevance of different possible risk factors (production system, density of sires, population of ewes, ewes:ram ratio, mating system and sires breed) upon B. ovis prevalence in Zacatecas, México. A sample of 544 rams was obtained in 153 flocks from four production systems. The serological test was determined by double immunodiffusion. The positive sampled rams were 18.6 % (101/544) and 10.5 % (16/153) of the sampled flocks had at least one positive ram. The semi-intensive production system showed a major prevalence (P<0.05) with 86.1 % (87/101) of the positive rams, the extensive system with 11.9 % (12/101), the backyard with 2.0 % (2/101) and the intensive did not register positives. The prevalence of B. ovis was higher in larger flocks, with the largest number of ewes and rams. Katahdin rams showed a major prevalence (30.8 %) (24/78) than Rambouillet (14.0 %) (18/129), Dorper (13.8 %) (31/224) and Suffolk rams (13.8 %) (8/58); (P<0.05).
2016
This cross-sectional study was conducted in the state of Minas Gerais, Brazil in 2011 to estimate the seroprevalence of bovine brucellosis (Brucella abortus) in properties and cattle, and to identify potential infection risk factors for herds with cows of reproductive age. The state was divided into seven regions: 1. Noroeste, Norte and Nordeste; 2. Leste; 3. Central; 4. Zona da Mata; 5. Sul and Sudoeste; 6. Alto Paranaíba; and 7. Triângulo Mineiro. Random, two-stage sampling was performed of both properties and cattle from each property. Blood samples were collected from 18,990 cows of reproductive age from 2,185 properties. The serologic tests used for the detection of anti-B. abortus antibodies included the buffered, acidified plate antigen test, as a screening test, with the 2-mercaptoethanol reduction, test as a confirmatory test, as recommended by the Programa Nacional de Controle e Erradicação da Brucelose e Tuberculose Animal – PNCEBT (National Program for the Control and Er...
Epidemiological situation of bovine brucellosis in the State of Paraiba, Brazil
Semina-ciencias Agrarias, 2016
This study was performed to characterize the epidemiological status of brucellosis in the State of Paraíba, Brazil. The State was divided into three regions. Herds were randomly sampled in each region and a pre-established number of animals were sampled in each of these herds. A total of 3,489 serum samples from 674 herds were collected. In each herd, an epidemiological questionnaire was conducted. This questionnaire focused on herd traits, as well as husbandry and sanitary practices that could be associated with the risk of infection. The serum samples were screened for antibodies against Brucella spp. by the Rose-Bengal Test (RBT), and all positive sera were confirmed by the 2-mercaptoethanol test (2-ME). The herd was considered positive if at least one animal had positive results for both the RBT and the 2-ME test. The prevalence rates of infected herds and animals in the State were 4.6% [3.2-6.5%] and 2.5% [1.1-3.9%], respectively. The prevalence rates of infected herds and animals in the regions were, respectively: region 1, 3.2% [1.5-6.6%] and 1.7% [0.5-5.7%]; region 2, 2.2% [0.9-5.2%] and 0.7% [0.3-1.7%]; and region 3, 7.9% [5.0-12.2%] and 3.2% [1.6-6.3%]. The risk factor (odds ratio, OR) associated with the presence of the infection was Zebuine as the predominant breed (OR=12.30 [1.32-114.64]).
[Epidemiology of caprine brucellosis in the Central Zone of the State of Veracruz]
PubMed, 2017
Introduction: Brucellosis is a disease of high morbidity that affects several animal species, is transmitted to humans and, therefore, is a zoonosis. It is caused by bacteria of the genus Brucella. In this study we aim to determine seroprevalence, risk factors, and spatial distribution of caprine brucellosis in 14 municipalities in the central region of the state of Veracruz. Materials and methods: This cross-stratified multistage study was conducted between 2009 and 2012. It included 572 animals of 81 production units selected by consensus according to the value tables of Cannon and Roe. The diagnosis was by Card Testing and Radial Immunodiffusion. The seroprevalence was determined with the VassarStats® risk factor program and odds. Results: The overall seroprevalence was 0.52% (95% CI: 0.13-1.65) and production units 2.47% (95% CI: 0.43-9.46). They were identified as risk factor for infection, production units in feedlot system and Card Testing seroconversion to vaccine against brucellosis; and as a protective factor, vaccination. Conclusions: Seroprevalence and distribution of goat brucellosis is low, the intensive system is a risk, and according with the Health Ministry in order that human cases are scarce.
El trabajo se planteó con el objetivo de conocer la respuesta del kenaf a diferentes alturas de corte en términos de densidad, altura y producción de biomasa. Se realizó durante 1997 y 1998 en el Campo Experimental Aldama INIFAP-CIRNE, localizado en el km 18.5 de la carretera Manuel-Soto la Marina, con clima semicálido subhúmedo A(C)w1. Se sembró la variedad ¿Everglades 41¿, con una distribución completamente al azar, con los siguientes tratamientos o cortes: testigo, 10, 20, 30 y 40 cm de altura. Se cosechó cada 40 días, haciendo el primer corte cuando las plantas alcanzaron 0.60 m de alto. Se separaron las hojas de los tallos para medir tanto el rendimiento de plantas completas como foliar. Se evaluó la altura y la densidad de plantas. La producción entre años fue diferente, debido principalmente a que la lluvia fue distinta. La altura de corte afectó el rendimiento, altura y número de plantas del kenaf. El testigo (un corte al final de la evaluación) mostró la mayor altura y prod...
Objective. Describe the situation of the bovine brucellosis in the Atlantic Coast and Antioquia (CAA) by analysis of epidemiological indicators during 2005-2013. Materials and methods. The data was obtained from epidemiological reports of the Colombian Agricultural Institute and the National Agricultural Census 2014. The annual departmental average of the variables studied was compared and it was performed a temporal analysis through graphical representation. Results. 44% of the positive farms were focused on the CAA; the positivity rate of farms in the CAA (27.9%) was higher and statistically significant when related to the average rate in the country (24.8%) being promoted by the least producing departments. Regarding to the cattle population, the CAA concentrated 47.0% of positive cattle in the country; however, the bovine positivity rate (5.8%) was statistically equal to the national average (5.3%); yet, the departments with lower cattle population had the highest rates. The best surveillance for bovine brucellosis was observed between 2005 and 2009, in contrast, during 2010, 2011 and 2013 there was a considerable reduction in the number of diagnoses, in both farms and cattle. In the least producing departments the temporary distribution of epidemiological indicators favored more the presence of the disease. Conclusions. The National Prevention Control and Eradication Program of Bovine Brucellosis in the CAA presented promising results, however, the lack of continuity in the diagnostic surveillance during some years and mainly in the least producing departments affected negatively their development.