Dataset Information

Genotypic homogeneity of multidrug resistant S. Typhimurium infecting distinct adult and childhood susceptibility groups in Blantyre, Malawi.

ABSTRACT: Nontyphoidal Salmonella (NTS) serovars are a common cause of bacteraemia in young children and HIV-infected adults in Malawi and elsewhere in sub-Saharan Africa. These patient populations provide diverse host-immune environments that have the potential to drive bacterial adaptation and evolution. We therefore investigated the diversity of 27 multidrug resistant (MDR) Salmonella Typhimurium strains isolated over 6 years (2002-2008) from HIV-infected adults and children and HIV-uninfected children. Sequence reads from whole-genome sequencing of these isolates using the Illumina GA platform were mapped to the genome of the laboratory strain S. Typhimurium SL1344 excluding homoplastic regions that contained prophage and insertion elements. A phylogenetic tree generated from single nucleotide polymorphisms showed that all 27 strains clustered with the prototypical MDR strain D23580. There was no clustering of strains based on host HIV status or age, suggesting that these susceptible populations acquire S. Typhimurium from common sources or that isolates are transmitted freely between these populations. However, 7/14 of the most recent isolates (2006/2008) formed a distinct clade that branched off 22 SNPs away from the cluster containing earlier isolates. These data suggest that the MDR bacterial population is not static, but is undergoing microevolution which might result in further epidemiology change.

SUBMITTER: Msefula CL

PROVIDER: S-EPMC3407126 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature

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Genotypic homogeneity of multidrug resistant S. Typhimurium infecting distinct adult and childhood susceptibility groups in Blantyre, Malawi.

Msefula Chisomo L CL Kingsley Robert A RA Gordon Melita A MA Molyneux Elizabeth E Molyneux Malcolm E ME MacLennan Calman A CA Dougan Gordon G Heyderman Robert S RS

PloS one 20120727 7

Nontyphoidal Salmonella (NTS) serovars are a common cause of bacteraemia in young children and HIV-infected adults in Malawi and elsewhere in sub-Saharan Africa. These patient populations provide diverse host-immune environments that have the potential to drive bacterial adaptation and evolution. We therefore investigated the diversity of 27 multidrug resistant (MDR) Salmonella Typhimurium strains isolated over 6 years (2002-2008) from HIV-infected adults and children and HIV-uninfected children ...[more]

PMID: 22848711

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Project description:BackgroundDespite advocating for male involvement in antenatal education, there is unmet need for antenatal education information for expectant couples. The objective of this study was to gain a deeper understanding of the education content for couples during antenatal education sessions in Malawi. This is needed for the development of a tailor-made curriculum for couple antenatal education in the country, later to be tested for acceptability, feasibility and effectiveness.MethodsAn exploratory cross sectional descriptive study using a qualitative approach was conducted in semi-urban areas of Blantyre District in Malawi from February to August 2016. We conducted four focus group discussions (FGDs) among men and women independently. We also conducted one focus group discussion with nurses/ midwives, 13 key informant interviews whose participants were drawn from both health-related and non-health related institutions; 10 in-depth interviews with couples and 10 separate in-depth interviews with men who had attended antenatal clinics before with their spouses. All the interviews were audiotaped, transcribed verbatim and translated from Chichewa, the local language, into English. We managed data with NVivo 10.0 and used the thematic content approach as a guide for analysis.ResultsWe identified one overarching theme: couple antenatal education information needs. The theme had three subthemes which were identified based on the three domains of the maternity cycle which are pregnancy, labour and delivery and postpartum period. Preferred topics were; description of pregnancy, care of pregnant women, role of men during perinatal period, family life birth preparedness and complication readiness plan, coitus during pregnancy and after delivery, childbirth and baby care.ConclusionAntenatal education is a potential platform to disseminate information and discuss with male partners the childbearing period and early parenting. Hence, if both men and women were to participate in antenatal education, their information needs should be prioritized. Men and women had similar choices of topics to be taught during couple antenatal education, with some minor variations.Electronic supplementary materialThe online version of this article (10.1186/s12884-018-2137-y) contains supplementary material, which is available to authorized users.

Project description:Salmonella Typhimurium is the leading cause of human non-typhoidal gastroenteritis in the US. S. Kentucky is one the most commonly recovered serovars from commercially processed poultry carcasses. This study compared the genotypic and phenotypic properties of two Salmonella enterica strains Typhimurium (ST221_31B) and Kentucky (SK222_32B) recovered from commercially processed chicken carcasses using whole genome sequencing, phenotype characterizations and an intracellular killing assay. Illumina MiSeq platform was used for sequencing of two Salmonella genomes. Phylogenetic analysis employing homologous alignment of a 1,185 non-duplicated protein-coding gene in the Salmonella core genome demonstrated fully resolved bifurcating patterns with varying levels of diversity that separated ST221_31B and SK222_32B genomes into distinct monophyletic serovar clades. Single nucleotide polymorphism (SNP) analysis identified 2,432 (ST19) SNPs within 13 Typhimurium genomes including ST221_31B representing Sequence Type ST19 and 650 (ST152) SNPs were detected within 13 Kentucky genomes including SK222_32B representing Sequence Type ST152. In addition to serovar-specific conserved coding sequences, the genomes of ST221_31B and SK222_32B harbor several genomic regions with significant genetic differences. These included phage and phage-like elements, carbon utilization or transport operons, fimbriae operons, putative membrane associated protein-encoding genes, antibiotic resistance genes, siderophore operons, and numerous hypothetical protein-encoding genes. Phenotype microarray results demonstrated that ST221_31B is capable of utilizing certain carbon compounds more efficiently as compared to SK222_3B; namely, 1,2-propanediol, M-inositol, L-threonine, α-D-lactose, D-tagatose, adonitol, formic acid, acetoacetic acid, and L-tartaric acid. ST221_31B survived for 48 h in macrophages, while SK222_32B was mostly eliminated. Further, a 3-fold growth of ST221_31B was observed at 24 hours post-infection in chicken granulosa cells while SK222_32B was unable to replicate in these cells. These results suggest that Salmonella Typhimurium can survive host defenses better and could be more invasive than Salmonella Kentucky and provide some insights into the genomic determinants responsible for these differences.

Dataset Information

Genotypic homogeneity of multidrug resistant S. Typhimurium infecting distinct adult and childhood susceptibility groups in Blantyre, Malawi.

Publications

Genotypic homogeneity of multidrug resistant S. Typhimurium infecting distinct adult and childhood susceptibility groups in Blantyre, Malawi.

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