A recent study has shed light on a concerning issue regarding urinary tract infections (UTIs) in Southern California. The research suggests that nearly one in five UTIs in the region may be caused by E. coli strains transmitted through contaminated meat, posing a hidden foodborne risk to millions of people not only in California but throughout the United States.
The study, titled “Zoonotic Escherichia coli and urinary tract infections in Southern California,” was published in the journal mBio. It highlights that individuals living in low-income neighborhoods are at the highest risk of contracting UTIs from foodborne sources.
Lead author Lance B. Price, a professor at the George Washington University, emphasized the significance of this research, stating that UTIs are not only a personal health concern but also a food safety issue. The findings underscore the need for increased focus on understanding and addressing the social determinants of health to prevent such infections, particularly in vulnerable communities.
UTIs are a prevalent health problem, predominantly affecting women and the elderly and resulting in substantial economic costs. E. coli, a common bacterium found in raw poultry and meat, is a leading cause of UTIs. However, accurately estimating the frequency of foodborne strains causing infections in humans has been challenging until now.
The study, conducted by researchers from GW and Kaiser Permanente Southern California, involved analyzing over 5,700 E. coli isolates from UTI patients and retail meat samples in the same neighborhoods. Using a novel genomic modeling approach, the researchers determined the likely origin of each bacterial strain, whether human or animal.
Key findings from the study include:
- 18% of UTIs in the study population were attributed to E. coli strains of animal origin, indicating foodborne UTIs.
- The strains posing the highest risk were predominantly found in chicken and turkey products.
- Individuals residing in low-income areas had a 60% higher likelihood of contracting foodborne UTIs compared to those in wealthier neighborhoods.
- Women and older men were identified as particularly vulnerable groups.
The researchers stress the need for further investigations to differentiate foodborne transmission from other potential sources, enhance models for identifying specific meat origins, and expand the study’s findings to other regions and types of infections. While the study focused on Southern California, evidence suggests that this issue extends nationwide.
Future research plans involve refining the host-origin prediction model, examining bloodstream infections and other severe E. coli-related illnesses, and exploring interventions to mitigate the risk of foodborne infections. In the interim, consumers are advised to take proactive measures to safeguard their health.
Recommendations for consumers include:
- Purchase securely sealed meat and poultry to prevent leakage.
- Thoroughly cook all meat and poultry products.
- Avoid cross-contamination in the kitchen by separating raw meat from other foods.
- Practice proper handwashing and surface cleaning after handling raw meat.
- Advocate for food safety policies that address disparities in retail and community environments.
For more information:
Maliha Aziz et al, Zoonotic Escherichia coli and urinary tract infections in Southern California, mBio (2025). DOI: 10.1128/mbio.01428-25 Read the full study here
