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  • Title: Salmonella Typhi From Blood Cultures in the Democratic Republic of the Congo: A 10-Year Surveillance.
    Author: Tack B, Phoba MF, Van Puyvelde S, Kalonji LM, Hardy L, Barbé B, Van der Sande MAB, Monsieurs E, Deborggraeve S, Lunguya O, Jacobs J.
    Journal: Clin Infect Dis; 2019 Mar 07; 68(Suppl 2):S130-S137. PubMed ID: 30845337.
    Abstract:
    BACKGROUND: This study gives an overview of a decade (2007-2017) of hospital-based Salmonella Typhi bloodstream infection (BSI) surveillance in the Democratic Republic of the Congo (DRC), at 4 main sampling sites. METHODS: Blood cultures were sampled in hospital-admitted patients with suspected BSI, according to standardized clinical indications. The results of the surveillance period 2015-2017 were compiled with those of previous surveillance periods (2007-2010 and 2011-2014). Whole genome sequencing of isolates with decreased ciprofloxacin susceptibility (DCS) was performed. RESULTS: Salmonella Typhi was isolated in 1.4% (531/37 388) and 10.3% (531/5177) of suspected and culture-confirmed BSI episodes, respectively. Salmonella Typhi ranked first among the BSI pathogens in adults (n = 220), but was mostly (n = 301 [56.7%]) isolated from children, of which 72.1% (217/301) and 31.6% (95/301) were <10 years and <5 years old, respectively. Multidrug resistance (MDR), DCS, and combined MDR/DCS were found in 38.3% (n = 180), 24.5% (n = 115), and 11.9% (n = 56) of 470 first isolates, respectively. MDR and DCS rates had increased since 2007, but remained stable during 2015-2017 with no geographical clustering at the province level. Most (91/93 [97.8%]) DCS isolates sequenced belonged to Genotyphi genotype 2.5.1, and gyr S83 was the most frequent DCS mutation (76/93 [81.7%]). Infections occurred perennially, but increased during the rainy season. CONCLUSIONS: Salmonella Typhi was a frequent cause of BSI in adults and children in DRC, with high rates of antibiotic resistance. Sustainable surveillance and implementation of vaccination are compelling.
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