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Salmonella enterica serovar Typhi and nontyphoidal Salmonella (NTS) cause the majority of bloodstream infections in sub-Saharan Africa; however, serotyping is rarely performed. We validated a multiplex polymerase chain reaction (PCR) assay with the White-Kauffmann-Le Minor (WKLM) scheme of serotyping using 110 Salmonella isolates from blood cultures of febrile children in Ghana and applied the method in other Typhoid Fever Surveillance in Africa Program study sites. In Ghana, 47 (43%) S. Typhi, 36 (33%) Salmonella enterica serovar Typhimurium, 14 (13%) Salmonella enterica serovar Dublin, and 13 (12%) Salmonella enterica serovar Enteritidis were identified by both multiplex PCR and the WKLM scheme separately. Using the validated multiplex PCR assay, we identified 42 (66%) S. Typhi, 14 (22%) S. Typhimurium, 2 (3%) S. Dublin, 2 (3%) S. Enteritidis, and 4 (6%) other Salmonella species from the febrile patients in Burkina Faso, Guinea-Bissau, Madagascar, Senegal, and Tanzania. Application of this multiplex PCR assay in sub-Saharan Africa could advance the knowledge of serotype distribution of Salmonella.
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http://dx.doi.org/10.1093/cid/civ782 | DOI Listing |
Biochemistry
December 2024
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
The pathogen-associated -glucosyltransferase IroB is involved in the biosynthesis of salmochelins, -glucosylated derivatives of enterobactin (Ent), which is a triscatecholate siderophore of enteric bacteria including and . Here, we reassess the ability of IroB to -glucosylate non-native triscatecholate mimics of Ent, which may have utility in the design and development of siderophore-based therapeutics and diagnostics. We establish TRENCAM (TC) and MECAM (MC), synthetic Ent analogs with tris(2-aminoethyl)amine- or mesitylene-derived backbones replacing the trilactone core of Ent, respectively, and their monoglucosylated congeners as substrates of IroB.
View Article and Find Full Text PDFMicrob Biotechnol
December 2024
Department of Microbiology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia.
Commercial probiotics are often formulated as multi-strain cocktails, but the effects of social interactions, particularly between strains of a species, are often neglected, despite their potential to contribute to higher-order interactions where these interactions could affect those with a third party. In this study, we investigated the probiotic potential of a collection of Bacillus subtilis strains against Salmonella Typhimurium in single-strain and mixed cultures. The results indicate a promising probiotic potential of B.
View Article and Find Full Text PDFFront Microbiol
December 2024
Department of Food Science and Technology, The Ohio State University, Columbus, OH, United States.
Advances in bacteriophage genome sequencing and regulatory approvals of some bacteriophages in various applications have renewed interest in these antibacterial viruses as a potential solution to persistent food safety challenges. Here, we analyzed in depth the genome of the previously studied bacteriophage OSYSP (phage OSYSP), revealed its application-related characteristics, and optimized its enumeration techniques for facilitating industrial implementation. We previously sequenced phage OSYSP genome completely by combining results from Illumina Miseq and Ion Torrent sequencing platforms and completing the remaining sequence gaps using PCR.
View Article and Find Full Text PDFBMC Microbiol
December 2024
Veterinary Public Health, College of Veterinary Medicine and Agriculture, Addis Ababa University, Bishoftu, Ethiopia.
Background: Salmonella enterica is a major cause of foodborne illness and mortality worldwide, but its presence in milk along the milk supply chain and associated public health risks are under-studied. This research was aimed to investigate the occurrence and antimicrobial susceptibility of Salmonella enterica in milk, milking environments, milkers' hands, and diarrheic patients in Wolaita Sodo, Ethiopia.
Methods: We collected 644 samples from 106 dairy farms that include direct milk from cow, bulk tank milk, milkers' hand swabs, teat surfaces swabs, farm floors swabs, milk storage containers swabs, collectors' bulk milk, retailers' bulk milk, and stool from diarrheic patients.
Anal Chem
December 2024
Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin 150030, China.
is one of the most dangerous and contagious foodborne pathogens, posing a significant threat to public health and food safety. In this study, we developed a click chemistry-based fluorescence biosensing platform for highly sensitive detection of () by integrating the -cleavage activity of CRISPR/Cas12a with the CLICK17-mediated copper(II)-dependent azide-alkyne cycloaddition (Cu(II)AAC) click reaction. Herein, CLICK-17 can provide binding sites for Cu ions and high redox stability for one or much catalytically vital Cu within its active sites, which facilitate the click reaction.
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