Simplificación de métodos para «controlar» la asistencia escolar

En artículo anterior hemos indicado las diversas finalidades que se pueden perseguir al comprobar las asistencias, podemos examinar más a fondo algunas costumbres que existen sobre la forma de efectuar esta tarea e introducir considerables simplificaciones y perfeccionamientos en estos hábitos rutinarios . Una d e las mejoras d e procedimiento más importantes es fijar un criterio concreto sobre la «rigurosidad o tolerancia» con la que en cada clase, se considerará que un alumno ha faltado o ha asistido . En ciertos casos puede exigirse la presencia desde el primer momento -aun antes de pasar lista-, mientras que, en otros, pueden considerarse asistentes a los que permanecen en el aula la mayoría de los minutos que dura la explicación

Evaluation of a competitive inhibition ELISA based on the recombinant protein tSAG1 to detect anti–Neospora caninum antibodies in cattle

Neospora caninum is a protozoan parasite that causes abortion and important economic losses in cattle worldwide. There are no treatments or vaccines available; disease control is based on diagnosis and herd management strategies. We developed, validated, and evaluated under field conditions a competitive inhibition ELISA based on the truncated SAG1 protein (tSAG1), expressed in Escherichia coli, and the RafNeo5 monoclonal antibody (ciELISAtSAG1). A criterion based on the 3-y sequential serologic analysis of 230 dairy cows by IFAT was used as the gold standard. The assay was validated using 860 serum samples from cows that were consistently positive or negative by IFAT throughout the study period. ciELISAtSAG1 was then used to evaluate the prevalence of neosporosis in 16 beef cow herds (22 samples per herd, 352 total samples). The results were compared with those from IFAT and a commercial cELISA (cELISAVMRD). The ciELISAtSAG1 cutoff was ≥ 29%I, with a diagnostic sensitivity of 98.7% (95% CI = 96.8–99.7%) and a diagnostic specificity of 97.9% (95% CI = 96.4–99.0%). Concordance among IFAT, cELISAVMRD, and ciELISAtSAG1 was 90.3%. The agreement (κ) between ciELISAtSAG1 and the other 2 tests was ≥ 0.81. The overall prevalence of neosporosis in the 16 beef herds was 30% (range: 5–60%). The ciELISAtSAG1 could be useful for large-scale detection of anti–N. caninum antibodies in cattle and seroepidemiologic investigations, given its appropriate sensitivity and specificity, and the simplicity of production.EEA RafaelaFil: Novoa, María Belen. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Valentini, Beatriz. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; ArgentinaFil: Sarli, Macarena. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Torioni, Susana. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; ArgentinaFil: Primo, María Evangelina. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Echaide, Ignacio. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentin

A vaccine using Anaplasma marginale subdominant type IV secretion system recombinant proteins was not protective against a virulent challenge

Anaplasma marginale is the most prevalent tick-borne livestock pathogen with worldwide distribution. Bovine anaplasmosis is a significant threat to cattle industry. Anaplasmosis outbreaks in endemic areas are prevented via vaccination with live A. centrale produced in splenectomized calves. Since A. centrale live vaccine can carry other pathogens and cause disease in adult cattle, research efforts are directed to develop safe recombinant subunit vaccines. Previous work found that the subdominant proteins of A. marginale type IV secretion system (T4SS) and the subdominant elongation factor-Tu (Ef-Tu) were involved in the protective immunity against the experimental challenge in cattle immunized with the A. marginale outer membrane (OM). This study evaluated the immunogenicity and protection conferred by recombinant VirB9.1, VirB9.2, VirB10, VirB11, and Ef-Tu proteins cloned and expressed in E. coli. Twenty steers were randomly clustered into four groups (G) of five animals each. Cattle from G1 and G2 were immunized with a mixture of 50 μg of each recombinant protein with Quil A® or Montanide™ adjuvants, respectively. Cattle from G3 and G4 (controls) were immunized with Quil A and Montanide adjuvants, respectively. Cattle received four immunizations at three-week intervals and were challenged with 107 A. marginale-parasitized erythrocytes 42 days after the fourth immunization. After challenge, all cattle showed clinical signs, with a significant drop of packed cell volume and a significant increase of parasitized erythrocytes (p<0.05), requiring treatment with oxytetracycline to prevent death. The levels of IgG2 induced in the immunized groups did not correlate with the observed lack of protection. Additional strategies are required to evaluate the role of these proteins and their potential utility in the development of effective vaccines.EEA RafaelaFil: Sarli, Macarena. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Novoa, María Belen. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Mazzucco, Matilde N. 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: Echaide, Ignacio Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina.Fil: Echaide, Susana T. de. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina.Fil: Primo, María Evangelina. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina

Validation and field evaluation of a competitive enzyme-linked immunosorbent assay for diagnosis of Babesia bovis infections in Argentina

Infections by Babesia bovis limit cattle production and cause important economic losses in tropical and subtropical areas around the world. Monitoring of calf sera can be used to detect unprotected cattle herds and to decide on strategic control measures, as well as for epidemiological studies. Merozoite surface antigen 2c (MSA-2c) is an immunodominant surface protein expressed in B. bovis merozoites and sporozoites and contains B-cell epitopes that are conserved among geographic isolates. A monoclonal antibody against recombinant MSA-2c (rMSA-2c) was previously shown to inhibit the binding of anti-B. bovis antibodies to a parasite B-cell epitope in a competitive enzyme-linked immunosorbent assay (cELISA) format. In the work at hand, the parameters of this cELISA were reevaluated and adjusted when necessary, and a cutoff value was determined by receiver operator characteristic (ROC) curve analysis of a total of 357 bovine sera of known reactivity, as assessed by indirect immunofluorescence assay (IFAT). The established rMSA-2c cELISA demonstrated a specificity of 98% and a sensitivity of 96.2%. An additional set of 303 field bovine sera from regions where ticks are endemic and tick-free regions of Argentina was tested by both rMSA-2c cELISA and IFAT, and the results were shown to be in very good agreement (kappa index, 0.8325). The performance shown by rMSA-2c cELISA in the detection of B. bovis-specific antibodies and its suitability for standardization and large-scale production, as well as the possibility of its application in most veterinary diagnostic laboratories, make the assay a powerful tool for the surveillance of herd immunity as a strategic measure for the control of bovine babesiosis.Fil: Dominguez, Mariana Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación en Ciencias Veterinarias y Agronómicas. Instituto de Patobiología; ArgentinaFil: Echaide, Ignacio Eduardo. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Santa Fe. Estación Experimental Agropecuaria Rafaela; ArgentinaFil: Torioni de Echaide, Susana Marta. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Santa Fe. Estación Experimental Agropecuaria Rafaela; ArgentinaFil: Wilkowsky, Silvina Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación en Ciencias Veterinarias y Agronómicas. Instituto de Biotecnología; ArgentinaFil: Zabal, Osvaldo Alfredo. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación en Ciencias Veterinarias y Agronómicas. Instituto de Virología; ArgentinaFil: Mosqueda, Juan J.. Universidad Autonoma de Queretaro.; MéxicoFil: Schnittger, Leonhard. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación en Ciencias Veterinarias y Agronómicas. Instituto de Patobiología; ArgentinaFil: Jacobsen, Monica Ofelia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación en Ciencias Veterinarias y Agronómicas. Instituto de Patobiología; Argentin

Coxiella burnetii in Ticks, Argentina

The Gammaproteobacterium Coxiella burnetii is the causative agent of acute Q fever and chronic endocarditis in humans worldwide. It is transmitted primarily by aerosol route or by ingestion of fomites from infected animals, mostly from domestic ruminants.Fil: Pacheco, Richard C.. Universidade Federal de Mato Grosso Do Sul; Brasil;Fil: Echaide, Ignacio Eduardo. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Santa Fe. Estación Experimental Agropecuaria, Rafaela; ArgentinaFil: Alves, Rosiane N.. Universidad Federal de Uberlândia; BrasilFil: Beletti, Marcelo E.. Universidad Federal de Uberlândia; BrasilFil: Nava, Santiago. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Santa Fe. Estación Experimental Agropecuaria, Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; ArgentinaFil: Labruna, Marcelo B.. Universidade Do Sao Paulo; Brasil

Bovipain-2, the falcipain-2 ortholog, is expressed in intraerythrocytic stages of the tick-transmitted hemoparasite Babesia bovis

<p>Abstract</p> <p>Background</p> <p>Cysteine proteases have been shown to be highly relevant for Apicomplexan parasites. In the case of <it>Babesia bovis</it>, a tick-transmitted hemoparasite of cattle, inhibitors of these enzymes were shown to hamper intraerythrocytic replication of the parasite, underscoring their importance for survival.</p> <p>Results</p> <p>Four papain-like cysteine proteases were found to be encoded by the <it>B. bovis </it>genome using the MEROPS database. One of them, the ortholog of <it>Plasmodium falciparum </it>falcipain-2, here named bovipain-2, was further characterized. Bovipain-2 is encoded in <it>B. bovis </it>chromosome 4 by an ORF of 1.3 kb, has a predicted molecular weight of 42 kDa, and is hydrophilic with the exception of a transmembrane region. It has orthologs in several other apicomplexans, and its predicted amino acid sequence shows a high degree of conservation among several <it>B. bovis </it>isolates from North and South America. Synteny studies demonstrated that the <it>bovipain-2 </it>gene has expanded in the genomes of two related piroplasmids, <it>Theileria parva </it>and <it>T. annulata</it>, into families of 6 and 7 clustered genes respectively. The <it>bovipain-2 g</it>ene is transcribed in <it>in vitro </it>cultured intra-erythrocyte forms of a virulent and an attenuated <it>B. bovis </it>strain from Argentina, and has no introns, as shown by RT-PCR followed by sequencing. Antibodies against a recombinant form of bovipain-2 recognized two parasite protein bands of 34 and 26 kDa, which coincide with the predicted sizes of the pro-peptidase and mature peptidase, respectively. Immunofluorescence studies showed an intracellular localization of bovipain-2 in the middle-rear region of <it>in vitro </it>cultured merozoites, as well as diffused in the cytoplasm of infected erythrocytes. Anti-bovipain-2 antibodies also reacted with <it>B. bigemina</it>-infected erythrocytes giving a similar pattern, which suggests cross-reactivity among these species. Antibodies in sera of two out of six <it>B. bovis</it>-experimentally infected bovines tested, reacted specifically with recombinant bovipain-2 in immunoblots, thus demonstrating expression and immunogenicity during bovine-infecting stages.</p> <p>Conclusions</p> <p>Overall, we present the characterization of bovipain-2 and demonstrate its <it>in vitro </it>and <it>in vivo </it>expression in virulent and attenuated strains. Given the involvement of apicomplexan cysteine proteases in essential parasite functions, bovipain-2 constitutes a new vaccine candidate and potential drug target for bovine babesiosis.</p

N-Glycosylation in piroplasmids : Diversity within simplicity

N-glycosylation has remained mostly unexplored in Piroplasmida, an order of tick-transmitted pathogens of veterinary and medical relevance. Analysis of 11 piroplasmid genomes revealed three distinct scenarios regarding N-glycosylation: Babesia sensu stricto (s.s.) species add one or two N-acetylglucosamine (NAcGlc) molecules to proteins; Theileria equi and Cytauxzoon felis add (NAcGlc)2-mannose, while B. microti and Theileria s.s. synthesize dolichol-P-P-NAcGlc and dolichol-P-P-(NAcGlc)2 without subsequent transfer to proteins. All piroplasmids possess the gene complement needed for the synthesis of the N-glycosylation substrates, dolichol-P and sugar nucleotides. The oligosaccharyl transferase of Babesia species, T. equi and C. felis, is predicted to be composed of only two subunits, STT3 and Ost1. Occurrence of short N-glycans in B. bovis merozoites was experimentally demonstrated by fluorescence microscopy using a NAcGlc-specific lectin. In vitro growth of B. bovis was significantly impaired by tunicamycin, an inhibitor of N-glycosylation, indicating a relevant role for N-glycosylation in this pathogen. Finally, genes coding for N-glycosylation enzymes and substrate biosynthesis are transcribed in B. bovis blood and tick stages, suggesting that this pathway is biologically relevant throughout the parasite life cycle. Elucidation of the role/s exerted by N-glycans will increase our understanding of these successful parasites, for which improved control measures are needed.Instituto de PatobiologíaFil: Florin-Christensen, Mónica. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Patobiología; ArgentinaFil: Florin-Christensen, Mónica. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Rodriguez, Anabel Elisa. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Patobiología; ArgentinaFil: Rodriguez, Anabel Elisa. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Suarez, Carlos Esteban. Washington State University. College of Veterinary Medicine. Department of Veterinary Microbiology and Pathology; Estados UnidosFil: Suarez, Carlos Esteban. United States Department of Agricultural-Agricultural Research Service. Animal Disease Research Unit; Estados UnidosFil: Ueti, Massaro W. Washington State University. College of Veterinary Medicine. Department of Veterinary Microbiology and Pathology; Estados UnidosFil: Ueti, Massaro W. United States Department of Agricultural-Agricultural Research Service. Animal Disease Research Unit; Estados UnidosFil: Delgado, Fernando Oscar. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Patobiología; ArgentinaFil: Delgado, Fernando Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Echaide, Ignacio Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; ArgentinaFil: Schnittger, Leonhard. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Patobiología; ArgentinaFil: Schnittger, Leonhard. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Cases of bovine anaplasmosis, babesiosis and trypanosomiasis registered at INTA Rafaela (2012 to 2019)

Anaplasmosis, babesiosis y tripanosomiasis de los bovinos son enfermedades de importancia económica provocadas por Anaplasma marginale, Babesia bovis y/o Babesia bigemina, y Trypanosoma vivax, respectivamente. En este trabajo se analizaron los protocolos recibidos durante 2012-2019 en el laboratorio de hemoparásitos de la EEA Rafaela con diagnóstico presuntivo de alguna de estas tres enfermedades. Se realizó diagnóstico etiológico de los casos mediante la observación microscópica del agente causal. Signos clínicos y resultados de pruebas serológicas y moleculares se consideraron como información complementaria. Se analizó la relación entre casos de anaplasmosis (variable dependiente), estación del año y zona con o sin presencia de Rhipicephalus microplus (variables independientes) mediante modelo lineal generalizado utilizando distribución binomial. El 50% de los protocolos provino de la Provincia de Santa Fe. Se arribó a un diagnóstico etiológico en el 48% (213/441) de los protocolos, de los cuales un 73% resultó positivo a anaplasmosis, 16% a babesiosis y 11% a tripanosomiasis. En zona libre de R. microplus se registraron 55 casos de anaplasmosis. La proporción de casos de anaplasmosis resultó significativamente mayor en otoño respecto a verano (p<0,05). El análisis conjunto de casos de anaplasmosis, estación del año y zona, no resultó significativo. La ocurrencia de casos de anaplasmosis en zonas consideradas naturalmente libres de la enfermedad confirma su estatus en expansión. Los brotes de babesiosis bovina continúan circunscriptos a las regiones con R. microplus. La tripanosomiasis bovina también es una enfermedad en expansión y debe ser considerada en el diagnóstico diferencial de enfermedades anemizantes.Bovine anaplasmosis, babesiosis and trypanosomiasis are diseases of economic importance caused by Anaplasma marginale, Babesia bovis and/or B. bigemina, and Trypanosoma vivax, respectively. In this work, protocols received during 2012-2019 in the laboratory of hemoparasites of the EEA Rafaela with a presumptive diagnosis of one of these three diseases were analyzed. The confirmatory diagnosis was made by microscopic observation of the causal agent. Clinical signs and results of serological and molecular tests were used as complementary information. Association between cases of anaplasmosis (dependent variable), the season of the year and area with or without the presence of Rhipicephalus microplus (independent variables) was analyzed with a generalized linear model using a binomial distribution. 50% of the protocols came from Santa Fe. Confirmatory diagnosis was achieved in 48% (213/441) of the protocols, of which 73% were positive for anaplasmosis, 16% for babesiosis and 11% for trypanosomiasis. In the R. microplus free area, 55 cases of anaplasmosis were recorded. The proportion of anaplasmosis cases was significantly higher in autumn compared to summer (p<0.05). No significant differences were observed when anaplasmosis cases, the season of the year and area were analyzed together. The occurrence of anaplasmosis cases in areas considered naturally free of the disease confirms its expansion. Outbreaks of bovine babesiosis occurred in areas with R. microplus. Bovine trypanosomiasis is also an expanding disease and should be considered in the differential diagnosis of hemoparasitic diseases.Fil: Mazzucco Panizza, M.. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Instituto de Investigacion de la Cadena Lactea. - Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Santa Fe. Estacion Experimental Agropecuaria Rafaela. Instituto de Investigacion de la Cadena Lactea.; ArgentinaFil: Novoa, María Belén. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Instituto de Investigacion de la Cadena Lactea. - Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Santa Fe. Estacion Experimental Agropecuaria Rafaela. Instituto de Investigacion de la Cadena Lactea.; ArgentinaFil: Sarli, Macarena. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Instituto de Investigacion de la Cadena Lactea. - Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Santa Fe. Estacion Experimental Agropecuaria Rafaela. Instituto de Investigacion de la Cadena Lactea.; ArgentinaFil: Signorini Porchietto, Marcelo Lisandro. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Instituto de Investigacion de la Cadena Lactea. - Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Santa Fe. Estacion Experimental Agropecuaria Rafaela. Instituto de Investigacion de la Cadena Lactea.; ArgentinaFil: Echaide, Ignacio Eduardo. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Santa Fe. Estación Experimental Agropecuaria Rafaela; Argentin

Neosporosis bovina en Argentina: a 25 años del primer reporte en el país

La neosporosis es una enfermedad de gran impacto en el ganado vacuno debido a que causa abortos en el segundo y último trimestre de la gestación. En esta revisión se resume y discute la información sobre la misma, recopilada de dos décadas y media de estudios en bovinos de Argentina. Se aportan datos sobre el diagnóstico, la prevalencia y los avances en el estudio de la enfermedad. Está dirigida a los médicos veterinarios dedicados al diagnóstico y a la investigación de la neosporosis y/o a la producción bovina.Neosporosis is a disease with great impact in cattle, responsible for abortions in the second and last trimester of gestation. The present revision summarizes and discusses information from two and a half decades of studies about the disease in cattle from Argentina, contributing data about prevalence, diagnosis and progress in the knowledge of the disease. this report will be of interest for veterinarians specialized in diagnosis and investigation of neosporosis and/or bovine production.EEA RafaelaFil: Campero, Lucía María. Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Laboratorio de Inmunoparasitología; ArgentinaFil: Campero, Lucía María. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Moore, Prando Dadin. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Moore, Prando Dadin. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; ArgentinaFil: Echaide, Ignacio Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; ArgentinaFil: Campero, Carlos Manuel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; ArgentinaFil: Venturini, María C. Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Laboratorio de Inmunoparasitología; Argentin

Bovine neosporosis in Argentina: 25 years from the first report in the country

La neosporosis es una enfermedad de gran impacto en el ganado vacuno debido a que causa abortos en el segundo y último trimestre de la gestación. En esta revisión se resume y discute la información sobre la misma, recopilada de dos décadas y media de estudios en bovinos de Argentina. Se aportan datos sobre el diagnóstico, la prevalencia y los avances en el estudio de la enfermedad. Está dirigida a los médicos veterinarios dedicados al diagnóstico y a la investigación de la neosporosis y/o a la producción bovina.Neosporosis is a disease with great impact in cattle, responsible for abortions in the second and last trimester of gestation. The present revision summarizes and discusses information from two and a half decades of studies about the disease in cattle from Argentina, contributing data about prevalence, diagnosis and progress in the knowledge of the disease. this report will be of interest for veterinarians specialized in diagnosis and investigation of neosporosis and/or bovine production.Facultad de Ciencias Veterinaria