Identification of Strains of Salmonella spp. Resistant to Antimicrobials, and Risk Factors for Circulation in Poultry and Pigs Kept in Backyard Production Systems in the Region of Libertador General Bernardo O'Higgins, Chile
Gómez Vega Elizabeth, Hamilton-West Miranda Christopher, Retamal Merino Patricio, Urcelay Vicente Santiago

Abstract
The increased incidence of Salmonella spp, causes a great impact on public and animal health, it is considered that this increase through animal production chains has a fundamental role in this event. The main reservoirs of Salmonella spp are animals asymptomatic carriers and sources of infection are the most common foods or products. The presence of this organism is considered a latent horizontal zoonotic risk for contamination from soil, feces, environment, improper storage, and even risk of vector contamination. Sampling was conducted in poultry and pigs kept in SPT in 10 communes belonging to the LGB O'Higgins Region. The main objective was to identify Salmonella strains resistant to antibiotics and risk factors for circulation associated with positive results in stool samples. Stool samples from 506 birds, 157 pigs, 1 sample at necropsy and 19 environmental samples were collected, giving as a total 683 samples from pigs kept in 113 SPT. The analysis indicated a positivity rate of 6.65% Salmonella in poultry and 21.23% in pigs. The results of this study demonstrate the identification of strains of Salmonella enteric subsp. Falkensee enteric serovar, Salmonella enteric subsp. enteric serovar Mbandaka and Salmonella enteric subsp. enteric serovar Enteritidis in populations of birds and pigs kept in SPT also risk factors that increase the likelihood that these populations are susceptible to Salmonella were identified.

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