The management of VTEC O157 infection

Area of Science:

• Infectious Diseases
• Clinical Microbiology
• Epidemiology

Background:

• VTEC O157 infections are increasing in incidence but represent less than 10% of UK food poisoning cases.
• Despite low overall numbers, VTEC O157 infections have a high propensity (2-15%) to cause severe, life-threatening complications such as hemolytic uremic syndrome (HUS) and thrombotic thrombocytopenic purpura (TTP).
• The mortality rate associated with HUS and TTP, especially during outbreaks (up to 30%), underscores the urgency for clinical and epidemiological focus.

Purpose of the Study:

• To describe the pathogenesis and epidemiology of VTEC O157 infections.
• To identify factors associated with the development of HUS/TTP complications.
• To present a clinical management scheme for VTEC O157 cases to prevent or treat complications.

Main Methods:

• Review of existing literature on VTEC O157 pathogenesis and epidemiology.
• Analysis of factors associated with HUS/TTP development, including age, hypochlorhydria, incubation period, and prior antibiotic use.
• Evaluation of laboratory markers (neutrophil leukocytosis, serum albumin, C-reactive protein) for predicting and monitoring HUS/TTP.
• Development of a clinical management scheme.

Main Results:

• Symptomatic VTEC O157 infections (e.g., bloody diarrhea) may aid in selecting cases for intensive management.
• Factors like young age (<15), advanced age (>65), clinical hypochlorhydria, and short incubation periods are linked to HUS/TTP development.
• Early neutrophil leukocytosis, serum albumin, and C-reactive protein are identified as potential predictors and monitoring markers for HUS/TTP.

Conclusions:

• VTEC O157 infections require focused attention due to their severe complication potential and mortality.
• Identifying at-risk patients and utilizing specific laboratory markers can guide clinical management.
• A proposed management scheme aims to optimize intervention for preventing or treating HUS/TTP complications.