Genomic analysis of Klebsiella pneumoniae isolates from Malawi reveals acquisition of multiple ESBL determinants across diverse lineages

Patrick Musicha, Chisomo L. Msefula, Alison E. Mather, Chrispin Chaguza, Amy K. Cain, Chikondi Peno, Teemu Kallonen, Margaret Khonga, Brigitte Denis, Katherine J. Gray, Robert S. Heyderman, Nicholas R. Thomson, Dean B. Everett, Nicholas A. Feasey

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Objectives: ESBL-producing Klebsiella pneumoniae (KPN) pose a major threat to human health globally. We carried out a WGS study to understand the genetic background of ESBL-producing KPN in Malawi and place them in the context of other global isolates. Methods: We sequenced genomes of 72 invasive and carriage KPN isolates collected from patients admitted to Queen Elizabeth Central Hospital, Blantyre, Malawi. We performed phylogenetic and population structure analyses on these and previously published genomes from Kenya (n=66) and from outside sub-Saharan Africa (n=67). We screened for presence of antimicrobial resistance (AMR) genetic determinants and carried out association analyses by genomic sequence cluster, AMR phenotype and time. Results: Malawian isolates fit within the global population structure of KPN, clustering into the major lineages of KpI, KpII and KpIII. KpI isolates from Malawi were more related to those from Kenya, with both collections exhibiting more clonality than isolates from the rest of the world. We identified multiple ESBL genes, including blaCTX-M-15, several blaSHV, blaTEM-63 and blaOXA-10, and other AMR genes, across diverse lineages of the KPN isolates from Malawi. No carbapenem resistance genes were detected; however, we detected IncFII and IncFIB plasmids that were similar to the carbapenem resistance-associated plasmid pNDM-mar. Conclusions: There are multiple ESBL genes across diverse KPN lineages in Malawi and plasmids in circulation that are capable of carrying carbapenem resistance. Unless appropriate interventions are rapidly put in place, these may lead to a high burden of locally untreatable infection in vulnerable populations.

Original languageBritish English
Article numberdkz032
Pages (from-to)1223-1232
Number of pages10
JournalJournal of Antimicrobial Chemotherapy
Volume74
Issue number5
DOIs
StatePublished - 1 May 2019

Fingerprint

Dive into the research topics of 'Genomic analysis of Klebsiella pneumoniae isolates from Malawi reveals acquisition of multiple ESBL determinants across diverse lineages'. Together they form a unique fingerprint.

Cite this