Browsing by Author "Araque Carvajal, Angeles Galilea"

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    Prevalencia y susceptibilidad de Staphylococcus aureus en mastitis subclínica bovina en Tungurahua, ecuador
    (Universidad Técnica de Ambato Carrera de Medicina Veterinaria, 2026-07) Araque Carvajal, Angeles Galilea; Villavicencio Villavicencio, Blanca Jeaneth
    The fragmentation of epidemiological information on bovine mammary health in the Ecuadorian highlands limits the design of effective control strategies against pathogens such as Staphylococcus aureus. Objective: to evaluate the prevalence of subclinical mastitis and the susceptibility profiles of Staphylococcus aureus in five cantons of Tungurahua, Ecuador. Method: a descriptive and cross- sectional study was conducted on 1343 cattle using the California Mastitis Test. Microbiological analysis was performed on 892 milk samples through hemolysis tests, Gram staining, mannitol salt agar, and coagulase activity; antimicrobial susceptibility was evaluated by disk diffusion, and data were processed using Chi-squared tests and 95 % confidence intervals in InfoStat. Results: the global prevalence of subclinical mastitis was 39.8 %, with 12.2 % positivity for S. aureus, highlighting a critical resistance to penicillin G (99.0 %) and the presence of multidrug-resistant strains with decreased sensitivity to ciprofloxacin and trimethoprim-sulfamethoxazole. Conclusion: subclinical mastitis in the region represents a persistent sanitary challenge with unusually high selective resistance pressure, making it imperative to replace empirical therapies with treatments based on local susceptibility profiles to mitigate economic and sanitary impacts.