The aim of this study was to investigate the presence of Salmonella enterica in by‑products (feathers, spleen, cecum, and crop) from broiler slaughterhouses as well as to determine the antimicrobial resistance profile of the identified serovars. Forty‑four lots of broilers in nine slaughterhouses located in the central‑west region of Brazil were evaluated. Samples of spleen, feathers, cecum, and crop were collected in a pool and a total of 1,232 samples were evalueted. These were processed for conventional bacterial isolation and subjected to biochemical and serological tests to identify serovars. The identified serovars were subjected to the antimicrobial susceptibility test, where nine different antimycotics were investigated. Salmonella enterica was identified in 7.1% (87/1,232) of all evaluated samples, mostly in feathers (12.3%) and spleen (8.1%). The most frequent serovars were Schwarzengrund (29.9%), Agona (25.4%), Mbandaka (12.7%) and Anatum (8.1%). Nine serovars showed resistance to at least one antimicrobial, especially serovars Mbandaka, Infantis and Typhimurium. Amoxicillin and tetracycline were not effective in inhibiting at least five and four serovars, respectively.
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http://dx.doi.org/10.12834/VetIt.2434.14968.1 | DOI Listing |
Vet Res
January 2025
National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, Key Laboratory of Zoonoses, Ministry of Agriculture, Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China.
S. Typhimurium is a significant zoonotic pathogen, and its survival and transmission rely on stress resistance and virulence factors. Therefore, identifying key regulatory elements is crucial for preventing and controlling S.
View Article and Find Full Text PDFSci Rep
January 2025
Department of Hematology/Oncology, Yousef Abdulatif Jameel Scientific Chair of Prophetic Medicine Application, Faculty of Medicine, King Abdulaziz University, Jeddah, 21589, Kingdom of Saudi Arabia.
This study investigated the green synthesis of Zn-MnO nanocomposites via the fungus Penicillium rubens. Herein, the synthesized Zn-MnO nanocomposites were confirmed by UV-spectrophotometry with a top peak (370 nm). Transmission electron microscopy confirmed irregular particles with a spherical-like shape ranging from 25.
View Article and Find Full Text PDFPoult Sci
January 2025
Shandong Provincial Key Laboratory for Livestock Germplasm Innovation Utilization, College of Animal Science and Technology, Shandong Agricultural University, Tai'an 271018 China. Electronic address:
Salmonella enterica serovar Enteritidis (S. Enteritidis) is a common zoonotic pathogen that not only causes gastroenteritis or death of livestock and poultry but also poses a serious threat to human health, causing severe economic losses to the poultry industry and society. Herein, RNA-sequencing (RNA-seq) was used to analyze the transcriptome variation of chicken cecum at four different time points (1, 3, 7, and 14 days) following S.
View Article and Find Full Text PDFMicrob Genom
January 2025
Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia.
Phylogenetic analyses are crucial for understanding microbial evolution and infectious disease transmission. Bacterial phylogenies are often inferred from SNP alignments, with SNPs as the fundamental signal within these data. SNP alignments can be reduced to a 'strict core' by removing those sites that do not have data present in every sample.
View Article and Find Full Text PDFMol Biol Evol
January 2025
Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS, INSERM, Université PSL, Paris, France.
The pangenome of a species is the set of all genes carried by at least one member of the species. In bacteria, pangenomes can be much larger than the set of genes carried by a single organism. Many questions remain unanswered regarding the evolutionary forces shaping the patterns of presence/absence of genes in pangenomes of a given species.
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