Enteric fever in Scotland 1975-1990

Area of Science:

• Epidemiology
• Infectious Diseases
• Public Health

Background:

• Typhoidal Salmonella infections, including typhoid and paratyphoid fever, pose a public health concern.
• Understanding the epidemiology of these diseases is crucial for effective prevention and control strategies.

Purpose of the Study:

• To analyze the incidence, sources, and demographic factors of typhoidal Salmonella infections in Scotland between 1975 and 1990.
• To identify trends in indigenous versus imported cases and assess transmission risks.

Main Methods:

• Retrospective analysis of reported cases of acute typhoidal Salmonella infections and identified chronic carriers in Scotland.
• Data collection covered a 16-year period (1975-1990).
• Analysis included case demographics, travel history, ethnicity, and acquisition source (indigenous vs. imported).

Main Results:

• A total of 267 acute infections and 32 chronic carriers were reported.
• Overall incidence remained stable, with a decrease in indigenous paratyphoid B and typhoid, but an increase in imported paratyphoid A.
• The majority of infections (81%) were acquired overseas, with UK residents of Asian ethnicity returning from the Indian subcontinent disproportionately affected by typhoid and paratyphoid A.

Conclusions:

• Indigenous transmission of enteric fever in the UK is low.
• Imported cases, particularly among travelers from the Indian subcontinent, are a significant source of infection.
• Traveler immunization is a key strategy to reduce typhoid incidence.