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Volume 71, Issue 8

Whole-genome analysis of strains isolated from persons with cystic fibrosis No Access

Abstract

is a commensal of the respiratory tract that is frequently present in cystic fibrosis (CF) patients and may cause infection. Antibiotic resistance is well described for CF strains, and virulence factors have been proposed.

The genetic diversity of strains present in the lungs of persons with CF is largely unknown despite the fact that this organism is considered to be a pathogen in this condition. The aim was to establish the genetic diversity and susceptibility of strains from persons with CF, and to screen the whole genomes of these strains for the presence of antibiotic resistance determinants and proposed virulence factors.

A total of 67 strains, recovered from respiratory samples from persons with CF from the UK (=1), Poland (=2), Spain (=24) and the Netherlands (=40), were subjected to whole-genome sequencing using Illumina technology and tested for antibiotic susceptibility. Forty-nine of these strains (one per different sequence type) were analysed for encoded virulence factors and resistance determinants.

The 67 strains represented 49 different sequence types. Susceptibility testing showed that all strains were susceptible to aztreonam, ciprofloxacin, imipenem and tetracycline. Susceptibility to ampicillin, ampicillin/sulbactam, amoxicillin/clavulanic acid, cefuroxime, cefixime, ceftriaxone, cefepime, meropenem, clarithromycin, co-trimoxazole and levofloxacin ranged from 70.2–98.5%. Only 6/49 strains (12.2%) harboured acquired resistance genes. Mutations associated with a ß-lactamase-negative ampicillin-resistant phenotype were present in four strains (8.2 %). The potential virulence factors, urease, haemoglobin- and haptoglobin-binding protein/carbamate kinase, and OmpP5 (OmpA), were encoded in more than half of the strains. The genes for HMW1, HMW2, adhesin, a IgA-specific serine endopeptidase autotransporter precursor, a TonB-dependent siderophore, an ABC-transporter ATP-binding protein, a methyltransferase, a BolA-family transcriptional regulator, glycosyltransferase Lic2B, a helix–turn–helix protein, an aspartate semialdehyde dehydrogenase and another glycosyltransferase were present in less than half of the strains.

The strains showed limited levels of resistance, with the highest being against co-trimoxazole. Sequences encoding a carbamate kinase and a haemoglobin- and haemoglobin–haptoglobin-binding-like protein, a glycosyl transferase and an urease may aid the colonization of the CF lung. The adhesins and other identified putative virulence factors did not seem to be necessary for colonization.

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Keyword(s): cystic fibrosis , Haemophilus influenzae , virulence factors and whole-genome sequencing
© 2022 The Authors
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2022-08-25
2024-05-03
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Whole-genome analysis of Haemophilus influenzae strains isolated from persons with cystic fibrosis
J. Med. Microbiol. 71, 001570 (2022); https://doi.org/10.1099/jmm.0.001570
/content/journal/jmm/10.1099/jmm.0.001570
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