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Journal of Global Antimicrobial Resistance
Article . 2024 . Peer-reviewed
License: CC BY NC ND
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UCrea
Article . 2024
License: CC BY NC ND
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Azithromycin-resistant mph(A)-positive Salmonella enterica serovar Typhi in the United States

Authors: Kaitlin A. Tagg; Justin Y. Kim; Britton Henderson; Meseret G. Birhane; Caroline Snyder; Carla Boutwell; Abiye Iyo; +7 Authors

Azithromycin-resistant mph(A)-positive Salmonella enterica serovar Typhi in the United States

Abstract

The United States Centers for Disease Control and Prevention (CDC) conducts active surveillance for typhoid fever cases caused by Salmonella enterica serovar Typhi (Typhi). Here we describe the characteristics of the first two cases of mph(A)-positive azithromycin-resistant Typhi identified through US surveillance.Isolates were submitted to public health laboratories, sequenced, and screened for antimicrobial resistance determinants and plasmids, as part of CDC PulseNet's routine genomic surveillance. Antimicrobial susceptibility testing and long-read sequencing were also performed. Basic case information (age, sex, travel, outcome) was collected through routine questionnaires; additional epidemiological data was requested through follow-up patient interviews.The patients are related and both reported travel to India (overlapping travel dates) before illness onset. Both Typhi genomes belong to the GenoTyphi lineage 4.3.1.1 and carry the azithromycin-resistance gene mph(A) on a PTU-FE (IncFIA/FIB/FII) plasmid. These strains differ genetically from mph(A)-positive Typhi genomes recently reported from Pakistan, suggesting independent emergence of azithromycin resistance in India.Cases of typhoid fever caused by Typhi strains resistant to all available oral treatment options are cause for concern and support the need for vaccination of travellers to Typhi endemic regions. US genomic surveillance serves as an important global sentinel for detection of strains with known and emerging antimicrobial resistance profiles, including strains from areas where routine surveillance is not conducted.

Country
Spain
Keywords

Azithromycin resistance, Adult, Male, India, Microbial Sensitivity Tests, Azithromycin, Salmonella typhi, Microbiology, QR1-502, United States, Anti-Bacterial Agents, S. Typhi, Drug Resistance, Bacterial, Humans, Female, Typhoid Fever, Plasmids

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
views
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