During an environmental study of bacterial resistance to antibiotics in coastal waters of the Kaštela Bay, Adriatic Sea, Croatia, 47 Burkholderia cepacia complex (Bcc) isolates were recovered from seawater and mussel (Mytilus galloprovincialis) samples. All isolates showed multiple antibiotic resistance. Among the isolates, two Burkholderia cenocepacia isolates produced chromosomally encoded TEM-116 extended-spectrum β-lactamase (ESBL). Analysis of outer membrane proteins revealed that decreased expression of a 36-kDa protein could be associated with a high level of β-lactam resistance in both isolates. Phenotypic study of efflux system also indicated an over-expression of Resistance-Nodulation-Cell Division (RND) efflux-mediated mechanism in one of the isolates. This study demonstrated the presence of Bcc in seawater and M. galloprovincialis, which gives evidence that coastal marine environment, including mussels, could be considered as a reservoir for Bcc species. Detection of ESBL-encoding genes indicates the potential role of these bacteria in the maintenance and dispersion of antibiotic resistance genes.
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Article Synopsis
- This study examines the prevalence of co-infections with Burkholderia cepacia complex (Bcc) in patients with respiratory infections like COVID-19 and H7N9, highlighting a lack of previous research on this topic.
- A total of 49 Bcc isolates were analyzed from patients, revealing that those infected with COVID-19 had a higher rate of multidrug resistance and a shorter median lethal time compared to those with H7N9.
- The findings suggest that COVID-19-Bcc may have evolved from H7N9-Bcc, demonstrating increased virulence and antibiotic resistance in the context of respiratory infections.
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