microbiology of diarrhoea in young beef and dairy calves in argentina.rotavirus, cryptosporidium sp, and salmonella spp. were investigated in the faeces of 452 diarrhoeic calves from 36 beef and 33 dairy herds. animals surveyed were from a few days of age up to approximately 1 month of life. enterotoxigenic escherichia coli (etec) was studied in 212 calves, aged 15 days or less. the animals were from the provinces of buenos aires (59% of the calves), córdoba (18%), santa fe (16%), entre ríos (5%) and la pampa (2%). a minimum of 4 calves were sampled on each farm. ...19902102011
arbovirus investigations in argentina, 1977-1980. i. historical aspects and description of study sites.this is the introductory paper to a series on the ecology of arboviruses in argentina. epizootics of equine encephalitis have occurred since at least 1908, principally in the pampa and espinal biogeographic zones, with significant economic losses; human cases of encephalitis have been rare or absent. both western equine and eastern equine encephalitis viruses have been isolated from horses during these epizootics, but the mosquitoes responsible for transmission have not been identified. a number ...19854037184
[an enzootic of colibacillus enterotoxicosis in calves].in december 1979, an enzootic with a high rate mortality diarrhea in few days old calves, fed artificially, began on a rural farm, located in el trébol (provincia de santa fe). bacteriologic studies allowed the isolation of escherichia coli from both blood and mesenteric lymph nodes. symptoms were reproduced in two healthy calves injected with a toxin made from this bacteria. autopsy of one of these calves revealed congestion and hemorrhagic disseminated in the intestinal mucus membrane together ...19826765622
[eperythrozoon teganodes infection in splenectomized calves in the province of santa fe, argentina].the finding of eperythrozoon teganodes in splenectomized calves from the santa fe province, argentina, is reported. the morphology of the agent and the clinical characteristics of the infection are described.19826965245
cadmium and lead levels in cow's milk from a milking region in santa fe, argentine. 19989484571
cypermethrin pour-on synergized with piperonyl butoxide: effects on haematobia irritans (diptera: muscidae) natural populations resistant to cypermethrin.development of pyrethroid resistance in haematobia irritans in santa fe province, argentina, resulted in an increased use of pyrethroid insecticides, probably due to lack of suitable alternative treatments. we explored the efficacy of mixtures of cypermethrin and piperonyl butoxide (pbo) against pyrethroid-resistant h. irritans. groups of 25 holstein cows each, naturally infested with cypermethrin resistant h. irritans were assigned to treated or control groups in april, september, october and d ...199910392769
[epidemiological vigilance of bovine tuberculosis in the castellanos department, santa fe]. 199910509399
[molecular study of argentine strains of bacillus anthracis].bacillus anthracis is one of the most monomorphic bacteria known and epidemiological studies of this microorganism have been hampered by the lack of molecular markers. for the genotyping of fourteen argentine field strains and the vaccine strain steme 34f2 the presence or absence of the virulence plasmids as well as vrra locus containing a variable-number tandem repeat (vntr) and presenting a polymorphism involving five variants, were analyzed. strains were isolated from cows, sheep and pigs dur ...200717702250
[isolation, characterization and typing of escherichia coil 0157:h7 strains from beef products and milk].shiga toxin (stx)-producing escherichia coli (stec) is an emergent pathogen associated with foodborne diseases, especially foodstuffs of animal origin. a total of 250 beef samples (ground beef and hamburgers) obtained from retail outlets in santa fe and santo tomé cities, and 150 milk samples from bulk tank milk from dairy barns of the region were analyzed by selective enrichment and immunomagnetic separation. escherichia coli o157:h7 stx2, eae and ehxa positive strains were isolated from three ...200717702260
[mycobacterium bovis in wildlife of the dairy regions of santa fe (argentina)].control eradication campaigns of bovine tuberculosis based on the «test and slaughter» approach were successful in many countries and regions; however, in some areas the infection persists and one of the main reasons is mycobacterium bovis infection in wild life species. argentina has applied the same approach since 1999, achieving progress in dairy cattle herds. nonetheless, the wildlife role has never been investigated. the objective of this study was to determine if wildlife from the santa fe ...201526376835
[total bacterial count in raw milk from the dairy farms that characterize the zone northwest of santa fe and south of santiago del estero].a total of 6,998 raw milk samples of bulk tank, belonging to 55 dairy farms associated to the cooperativa tambera nueva alpina ltda., were collected between the years 1993 and 2002. the total mesophilic aerobic microorganisms count was analyzed, obtaining a medium value of 1.2 x 10(5) +/- 2.4 x 10(5) cfu/ml that characterizes the zone. the final year of experience, observed a 97% of dairy farms evaluated with averages < or = 1.0 x 10(5) cfu/ml. only a 3% it surpasses this limit, not being found ...200415559198
development of a tandem repeat-based multilocus typing system distinguishing babesia bovis geographic and microsatellite sequences have proven to be excellent tools for the differentiation of strains and populations in several protozoan parasites due to their high variability. in the present work we have searched the genome of the tick-transmitted bovine hemoprotozoon babesia bovis for tandem repeats (trs) that could be useful for a multilocus typing system. hundred and nineteen sequences were shortlisted and tested in five common b. bovis reference isolates originating from distinct geogr ...201019833439
use of spatial statistics and monitoring data to identify clustering of bovine tuberculosis in argentina.the spatial distribution of endemic bovine tuberculosis (tb) in argentine cattle herds was described using recorded information on the detection of tb-like lesions in cattle slaughtered between march 1995 and 1997 at 126 slaughterhouses with federal inspection. approximately, 47% (9472396 cattle) of the estimated total number of cattle slaughtered in argentina during this period was included in the study. information on the number of cattle per source herd consigned to slaughter, number of cattl ...200212419600
simulation model of within-herd transmission of bovine tuberculosis in argentine dairy herds.transmission of bovine tuberculosis was quantified in three dairy herds located in south santa fe province, argentina. using estimates of mycobacterium bovis transmission (beta) and a reed-frost simulation model, the prevalence of tuberculosis infection in the study herds over time was investigated. the reed-frost model was modified by incorporating randomness in both beta and the incubation period (alpha) of m. bovis. the mean estimated herd beta was 2.2 infective contacts per year and did not ...200212163252
long-term study of haematobia irritans (diptera: muscidae) seasonal distribution in central argentina with focus on winter fly abundance.the seasonal distribution of haematobia irritans (linnaeus, 1758) was evaluated at 31 degrees 12' s-61 degrees 29' w, santa fe, argentina from november 1992 to august 2000 by weekly fly counts on 20 holstein cows not treated against ectoparasites. the analysis was mainly focused on winter fly abundance. two peaks of abundance were found from spring to autumn. adults of h. irritans were consistently found on cattle during winter, with increasing numbers from the end of july to late august. the on ...200111802276
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