The aim of the study was to determine the presence of Trypanosoma spp in Rattus spp from food markets and pig farms in Lima, Peru, to identify the species of Trypanosoma spp by morphological and biometric characterization, and to correlate the presence of the parasite with the variables sex, age (juvenile and adult), origin and species. The study was conducted in eight food markets of six districts (n = 62 rats) and three pig farms (n = 99) from three districts of Lima. Blood samples were collected and analysed using the thin blood smear technique and stained with «Hemacolor» to determine the presence of the parasite. The identification of the Trypanosome species was based on international keys based on the morphological and biometric characteristics of the trypomastigotes present in blood smears stained with Giemsa. T. lewisi was the only species found in a frequency of 22.5 and 21.2%...

El objetivo del estudio fue determinar la presencia de Trypanosoma spp en Rattus spp de mercados de abasto y granjas porcinas en Lima, Perú, identificar las especies de Trypanosoma spp mediante caracterización morfológica y biométrica, y correlacionar la presencia del parásito con las variables sexo, edad (juvenil y adulto), procedencia y especie. El estudio se desarrolló en ocho mercados de abasto de seis distritos (n=62 ratas) y en tres granjas porcinas (n=99) de tres distritos de Lima. Se colectaron muestras de sangre y se analizaron mediante la técnica de frotis sanguíneo delgado coloreado con la tinción rápida «Hemacolor» para determinar la presencia del parásito. La identificación de las especies de tripanosomas se hizo con claves internacionales con base a las características morfológicas y biométricas de los tripomastigotes presentes en frotis sanguíneos colorea...

The aim of this study was to determine the profile of antibiotic resistance of isolated Salmonella enterica strains during the slaughtering process of pigs in a slaughterhouse in Lima. Strains of Salmonella enterica (n=148) isolated from stool samples and mesenteric ganglia of pigs were used. The evaluation of antibiotic resistance was performed by the disc diffusion method (Kirby-Bauer). Thirteen antibiotics of frequent use in human medicine were considered, of which most of them are also used in pigs as prophylactic and growth promoters. All strains showed resistance to tetracycline and all showed sensitivity to ciprofloxacin. Likewise, all strains were resistant to at least one antibiotic.

The aim of this study was to determine the profile of antibiotic resistance of isolated Salmonella enterica strains during the slaughtering process of pigs in a slaughterhouse in Lima. Strains of Salmonella enterica (n=148) isolated from stool samples and mesenteric ganglia of pigs were used. The evaluation of antibiotic resistance was performed by the disc diffusion method (Kirby-Bauer). Thirteen antibiotics of frequent use in human medicine were considered, of which most of them are also used in pigs as prophylactic and growth promoters. All strains showed resistance to tetracycline and all showed sensitivity to ciprofloxacin. Likewise, all strains were resistant to at least one antibiotic.

The aim of this study was to evaluate the antimicrobial activity of essential oil of oregano (Origanum vulgare) against Staphylococcus aureus ATCC 25923 in chicken meat. The Minimum Inhibitory Concentration (MIC) was determined by the microdilution method in wells and the Minimum Bactericidal Concentration (MBC) to determine the survival of bacteria exposed to different concentrations of essential oil. In addition, the ability of oregano essential oil to inhibit the growth of S. aureus in chicken fillets was evaluated. A MIC of 0.5% and a CMB of 4% were obtained. Concentrations ≥1% of oregano essential oil significantly (p<0.05) reduced S. aureus counts in chicken meat at levels directly related to the applied concentration. The results showed that oregano oil has an antimicrobial effect against S. aureus ATCC 25923.