The objective of this study was to identify microorganisms of the order Rickettsiales of veterinary and public health importance potentially transmitted by native hard ticks that parasitise cattle and humans in the province of Santa Fe. Between December 2020 and March 2021, ticks in the non-parasitic phase were collected in different localities in the north of the province. DNA was extracted from 14 specimens (Amblyomma ovale, Amblyomma sculptum, and Haemaphysalis juxtakochi) and polymerase chain reactions were performed to detect bacteria of the genus Rickettsia and the family Anaplasmataceae. Nine samples tested positive: five from the genus Rickettsia (all A. ovale) and four from the family Anaplasmataceae (A. ovale and H. juxtakochi). Two nymphs of A. ovale tested positive in both assays. Based on the sequences obtained, the samples were identified as Rickettsia bellii and Francisella-like endosymbionts (FLE). This study represents the first molecular detection of these bacteria in native ticks in Santa Fe, expanding their known distribution in Argentina. The detection of R. bellii in A. ovale confirms the circulation of this low health implications bacterium in ticks in the region, whereas the detection of FLE in A. ovale and H. juxtakochi represents a novel finding worldwide.
Haemonchus contortus is reported for the first time in sheep from Argentine Patagonia. The finding was obtained from a pooled fecal culture of samples collected in May 2025. Larval identification was based on morphological characteristics observed under a light microscope and was subsequently confirmed by species-specific PCR analysis. H. contortus is a blood-feeding nematode with high sanitary and productive impact, traditionally restricted to warm and humid regions. Its detection in a cold temperate region suggests a potential southward expansion of its geographic range in Argentina, following patterns observed in other parts of the world under climate change scenarios. This finding highlights the need for epidemiological surveillance to assess its establishment and potential implications for sheep health in the region.
This study presents the nutritional composition of Macrocystis pyrifera, brown seaweed, from the South Atlantic Ocean. Preliminary, we consider the use of this species as food for ovine cattle during critical situations in the Deseado Department, Santa Cruz province. Protein analysis, lipids, total and insoluble dietary fibers, humidity, and ashes determination were measured following the AOAC (2005) protocols. Besides, the crude protein, ethereal extract, dry material, ashes, potassium and sodium were determined by centesimal analysis. The copper determination, previously acid digestion, was made through flame atomic absorption spectrophotometry. The nutritional values of protein, lipids and carbohydrates were low. The copper was low and there is no risk of toxicity for chronic ingestion of the ovine. These results indicate that this seaweed species would be a food supplement of low energy for the ovine cattle. This preliminary work considers experimental studies about the answer animal of this supplement food ‘consume. We will analyze the contributions to promoting alternative food in a critical context in the north Santa Cruz province behind sustainable practices in the harvest seaweed.
La equinococosis quística o hidatidosis es una enfermedad zoonótica causada por el estadio larval de parásitos pertenecientes al complejo de especies denominado Echinococcus granulosus sensu lato (s.l.). Su distribución es mundial y representa un problema significativo para la salud pública y veterinaria. En Argentina es endémica y hay varias regiones que cumplen los requisitos para desarrollar el ciclo doméstico de este parásito. El objetivo del presente trabajo fue reportar y caracterizar un caso de equinococosis quística porcina ocurrido en una zona periurbana del partido de Gral. Lavalle, provincia de Buenos Aires, Argentina. Se tomaron muestras para determinar la fertilidad, vitalidad y viabilidad, estudios al microscopio invertido y electrónico de barrido y estudiar la morfología de ganchos rostelares. El hígado presentó 35 quistes hidatídicos. Se examinaron 25 (96% fertilidad). Se recuperaron 4 ml de protoescólex (vitalidad: 99-100%) que presentaron la estructura y ultraestructura características. Ratones hembra de la cepa CF1 fueron infectados por vía intraperitoneal con 1500 protoescólex. Luego de 4 meses post infección se realizó la eutanasia y necropsia de los mismos y no se observó desarrollo quístico en la cavidad peritoneal. Por el análisis morfométrico de los ganchos rostelares se pudo determinar que las muestras son compatibles con la especie E. canadensis. Los resultados de este trabajo aportan al conocimiento de las especies y genotipos del complejo E. granulosus s.l. presentes en la provincia de Buenos Aires y evidencia la importancia de implementar estrategias de control y vigilancia epidemiológica sostenidas en el tiempo.
Standardizing the units used for the animals’ treatments with antimicrobials is crucial to enable clear quantification and to compare with other species and regions. The aim of this study was to assign the Defined Daily Doses (DDDvetArg) and Defined Course Doses (DCDvetArg) for cattle in Argentina, for each antimicrobial and route of administration, using the information obtained from the product label and veterinary vademecums. Fifty-seven laboratories were identified, and the products were classified according to the route of administration (oral, intrauterine and topic). A total of 28 formulations for oral administration were recorded, and 30 corresponding to intrauterine and topical routes of administration. In case it was necessary, standard weights were applied for the doses calculation. From this information, a database was generated to calculate the DDDvetAr and DCDvetArg. The products that contained antimicrobials as growth promotors were excluded, as they are forbidden in Argentina since 2019. The doses standardization allows more precise surveillance about the antimicrobial use in cattle, which is key facing the global challenge of antimicrobial resistance.
