Genomic Study Tracks Rapid Spread of Drug-Resistant Sexually Transmitted Shigella in England

A nationwide genomic epidemiology study, published in The Lancet Infectious Diseases and led by the University of Cambridge and UK Health Security Agency (UKHSA), has revealed that sexually transmitted *Shigella sonnei* is spreading faster and with higher transmission intensity than non-sexually transmitted strains in England. The study provides detailed mapping of how *Shigella*, traditionally a food and water-borne infection, has evolved into a rapidly circulating, drug-resistant sexually transmitted infection primarily affecting sexual networks of gay, bisexual, and other men who have sex with men.

Context

Traditionally, *Shigella* infections are associated with contaminated food and water. Recent findings indicate a shift in transmission patterns, with *Shigella sonnei* now circulating primarily through sexual contact. This change has raised concerns about the effectiveness of existing treatments due to increasing drug resistance.

Why it matters

The rapid spread of drug-resistant *Shigella sonnei* poses significant public health challenges. Understanding its transmission dynamics is crucial for developing effective prevention and treatment strategies. This issue highlights the need for increased awareness and targeted interventions within specific communities.

Implications

The emergence of drug-resistant *Shigella sonnei* could lead to increased healthcare costs and a greater burden on health services. Communities most affected, particularly gay, bisexual, and other men who have sex with men, may face heightened health risks. The findings may also prompt changes in sexual health policies and practices.

What to watch

Health authorities may implement new public health campaigns aimed at educating affected communities about the risks and prevention methods. Monitoring of infection rates and transmission patterns will be critical in the coming months. Researchers will likely continue to study the genetic factors contributing to the spread of this strain.