Population dynamics of Salmonella enterica following single dose metaphylactic antibiotic use within cohorts of beef cattle followed to slaughter.

Population dynamics of Salmonella enterica following single dose metaphylactic antibiotic use within cohorts of beef cattle followed to slaughter. Appl Environ Microbiol. 2019 Sep 13;: Authors: Levent G, Schlochtermeier A, Ives SE, Norman KN, Lawhon SD, Loneragan GH, Anderson RC, Vinasco J, Scott HM Abstract Antibiotic use in cattle can select for multidrug-resistant Salmonella enterica, which is considered a serious threat by the U.S. Centers for Disease Control and Prevention. A randomized controlled longitudinal field trial was designed to determine the long-term effects of a single dose of ceftiofur or tulathromycin on Salmonella population characteristics among cattle feces, peripheral lymph nodes, and hides. A total of 134 beef cattle from two sources was divided among 12 pens, with cattle in each of the three-pen blocks receiving either a single dose of ceftiofur or tulathromycin on Day 0, or else neither (control). Fecal samples were collected before treatment (Day 0), and repeatedly following treatment until slaughter (Day 99+). Hide and lymph node samples were collected at slaughter age. Salmonella prevalence, phenotypic antimicrobial resistance, serotype, and phylogenetic relationships were examined. Multilevel mixed logistic regression models indicated no significant effects (P ≥0.218) of metaphylactic antibiotic on prevalence of Salmonella across sample types. However, there was a significant day effect observed with prevalence increasing...
Source: Applied and Environmental Microbiology - Category: Microbiology Authors: Tags: Appl Environ Microbiol Source Type: research

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Source: Comparative Immunology, Microbiology and Infectious Diseases - Category: Infectious Diseases Source Type: research
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Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
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Source: Journal of Global Antimicrobial Resistance - Category: Infectious Diseases Source Type: research
This study provides systematic and comprehensive data on the prevalence and antimicrobial resistance profiles of various Salmonella serovars isolated from meat products in China, indicating their potential risk to public health.
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
In this study, a combination of whole genome sequencing and amplicon analysis was used to investigate the changes in microbial community and antimicrobial resistance genes in response to different salt content during red pepper fermentation. While the family Enterobacteriaceae dominated in high-salt (15-25%) samples, Lactobacillaceae quickly became the dominant population in place of Enterobacteriaceae after 24 days in 10% salt samples. Compared to 0.05 antibiotic resistance genes (ARGs) per cell number on average in 10% salt sample, 16.6 ARGs were present in high-salt samples, wherein the bacterial hosts were major assign...
Source: Food Microbiology - Category: Food Science Authors: Tags: Food Microbiol Source Type: research
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Source: Journal of Global Antimicrobial Resistance - Category: Infectious Diseases Source Type: research
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Source: International Journal of Food Microbiology - Category: Food Science Authors: Tags: Int J Food Microbiol Source Type: research
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Source: Food Control - Category: Food Science Source Type: research
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Source: Microbial Pathogenesis - Category: Infectious Diseases Source Type: research
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Source: Antimicrobial Agents and Chemotherapy - Category: Microbiology Authors: Tags: Antimicrob Agents Chemother Source Type: research
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