seasonal variation of oribatid mite (acarina) populations and their relationship to sheep cestodiasis in argentina.samples of soil were collected monthly from two ranches in the zone of puan, province of buenos aires, argentina. the monthly distribution of males, females without eggs and females with eggs for the dominant species of oribatid mites were studied. the dominant species were zygoribatula lata in ranch a, and zygoribatula elongata in ranch b. both species are hosts of moniezia expansa rudolphi, 1810 and helictometra giardi baer, 1927. based on the data presented, the factors associated with transm ...19921615627
[1st isolation of strains of staphylococcus aureus producing toxic shock syndrome toxin 1 in food handlers in argentina].thirty nine milk handlers from a factory of dairy products in the province of buenos aires were examined for their nasal carriage of s. aureus strains capable of producing toxic-shock-syndrome toxin-1 (tsst-1). in addition, chance samples of handled foods, crude milk and milky fermented derivates (mfd) were studied. strain isolation was made on mannitol salt agar and on baird-parker agar. typical colonies were identified by their biochemical properties. cultures that were found to be s. aureus w ...19902102013
the prevalence of anthelmintic resistance in nematode parasites of sheep in southern latin america: argentina.sixty-five sheep farms in the northern provinces of buenos aires, entre rios, corrientes, cordoba and sante fe were used in this survey on anthelmintic resistance. anthelmintic groups tested were the benzimidazoles, levamisole, the combination levamisole + benzimidazole product and the avermectins. the overall level of resistance was 46% of properties, with resistance to the individual drug groups being 40%, 22%, 11% and 6%, respectively. on a large proportion of farms the resistance recorded wa ...19968686164
[seroprevalence of viral infections in llamas (lama glama) in the republic of argentina].this study reports the seroprevalence of bovine viral infections in llamas (lama glama) in argentina. this is the first study made in the country including 390 llamas and testing antibodies against eight viruses. samples were collected from nine farms distributed in three different provinces: buenos aires, córdoba and jujuy. the samples were tested for antibodies against eight viruses known to infect cattle: bovine herpesvirus type 1 (bhv-1), bovine viral diarrhea virus (bvdv), bovine adenovirus ...19979229724
genetic variation and epidemiology of echinococcus granulosus in argentina.polymerase chain reaction-ribosomal its-1 dna (rdna) restriction fragment length polymorphism (pcr-rflp) analysis and sequencing of the mitochondrial cytochrome c oxidase subunit 1 (co1) and nadh dehydrogenase 1 (nd1) genes were used to characterize 33 echinococcus granulosus isolates collected from different regions and hosts in argentina, and to determine which genotypes occurred in humans with cystic hydatid disease. the results of the study demonstrated the presence of at least 4 distinct ge ...199910363285
[high prevalence of beta hemolytic streptococci isolated from throat swabs in buenos aires].beta hemolytic streptococci, particulary group a, are the most frequently isolated pathogens in cases of pharyngoamigdalitis. other beta hemolytic streptococci also produce this pathology. an increase of positive cultures for group a streptococci was detected during 2004 in relation to previous years. the aim of this study was to determine the isolation rates of beta hemolytic streptococci groups a, c and g during a period of 5 years. pharyngeal exudates were obtained from children (aged 6 month ...200516193708
[the epidemiology of hemolytic uremic syndrome in argentina. diagnosis of the etiologic agent, reservoirs and routes of transmission].shiga toxin-producing escherichia coli (stec) cause sporadic cases and outbreaks of nonbloody and bloody diarrhea, and hemolytic uremic syndrome (hus). e. coil o157:h7 is the most prevalent stec serotype. however, other serotypes (o26:h11; o103:h2; o111:nm; o121:h19; o145:nm, among others) can cause a similar disease spectrum. shiga toxins (stx1, stx2, and their variants), intimin, and enterohemolysin are the main virulence factors. three different diagnostic criteria are used to determine the f ...200617354474
[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
experimental toxicity of verbesina encelioides in sheep and isolation of galegine.verbesina encelioides is a widely distributed weed in argentina. although it has been suspected as poisonous, there seem to be no previous reports of its toxicity in this country. its biological activity was evaluated through an experiment in sheep. four 5-y-old sheep, averaging 33 kg in body weight, were given a single dose of 1.0, 3.2, 5.0 or 6.3 g of dried plant material (17.9% dry matter)/kg body weight orally in a water suspension. forty-eight hours later, the animals given 5.0 g or 6.3 g s ...19968948070
an outbreak of hepatogenous photosensitization in sheep grazing tribulus terrestris in outbreak of hepatogenous photosensitization occurred in 40% of sheep grazing tribulus terrestris in southern buenos aires province. postmortem examinations revealed diffuse jaundice and ochre discoloration of the liver. histopathological liver lesions consisted of fibroplasia, periductular lamellar fibrosis, hyperplasia of small bile ducts and diffuse swelling of hepatocytes. a crystalloid material was observed in some bile ducts. aspartate aminotransferase and gamma glutamyltransferase serum ...19947975136
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