Drug-Resistant Shigella Cases Increased Globally
Extensively drug-resistant Shigella bacteria spread across the U.S. and Canada, with rising prevalence since 2011.
Updated on Oct. 9, 2026 in COVID-19
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Extensively drug-resistant (XDR) Shigella cases rose from 0% in 2011 to 8.5% in 2023 in the United States. Similar trends emerged in Canada, where prevalence climbed from 1% in 2018 to 6.6% in 2022.
Why it matters
The rise of XDR Shigella is significant because the bacteria have developed resistance to all five standard antibiotics, complicating clinical treatment. These infections spread through sexual contact, contaminated surfaces, and water, posing a serious challenge to public health management.
Of analyzed cases, 86.2% involved men and 46.6% of patients reported HIV co-infection. XDR Shigella strains are defined by their complete resistance to all five standard antibiotic treatments.
The details
The bacteria, which spread through contaminated food, water, surfaces, and sexual contact, have sickened dozens in specific localized outbreaks. Reports confirmed 56 infections in a 2022 Montreal outbreak and 63 infections in a 2024 Calgary event.
Timeline
2011-2023: Analyzed period for U.S. Shigella cases.
2021: Outbreak in Vancouver's Downtown Eastside.
September 2022: Outbreak in Montreal.
2018-2022: Period of XDR Shigella increase in Canada.
July 2024: Outbreak in Calgary.
The Big Picture
This report follows the pattern set by foodborne and contact-based pathogen surveillance in tracking outbreaks. It tracks the epidemiological evolution of antibiotic-resistant bacteria similar to the transmission patterns observed in the 2018 Cyclospora outbreak linked to McDonald's salads.
Individuals should maintain rigorous hygiene practices, including thorough handwashing, to prevent the spread of these resistant bacteria. Those experiencing symptoms should consult medical providers immediately, as standard antibiotic treatments may no longer be effective for these strains.
The takeaway
The emergence of extensively drug-resistant bacteria underscores the growing difficulty of treating common infections with traditional medicine. Public health agencies urge heightened surveillance and awareness as these resistant strains become more prevalent in general populations.
Further reading
Learn more about evolving infection trends in our COVID-19 section.
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