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Pattern analysis of human Salmonella enteritidis infection
K Bögel1, A Käsbohrer, K Stöhr
1WHO Collaborating Centre on VPH, Veterinary School, Hannover, Germany.
Zentralblatt Fur Bakteriologie : International Journal of Medical Microbiology
|October 1, 1995
Summary
Salmonella enteritidis (SE) case accumulations (ACCs) represent a distinct and significant element of SE epidemics, often lasting longer and affecting more people than officially reported outbreaks. Early detection methods for ACCs are crucial for public health.
Area of Science:
- Epidemiology
- Infectious Disease Surveillance
- Foodborne Illness
Background:
- Salmonella enteritidis (SE) and Salmonella typhimurium (ST) are significant causes of foodborne illness.
- Understanding transmission patterns is crucial for effective public health interventions.
Purpose of the Study:
- To analyze clusters and trends in Salmonella infections to identify distinct transmission categories.
- To compare the characteristics of Salmonella enteritidis (SE) outbreaks and case accumulations (ACCs).
Main Methods:
- Analysis of 10,368 SE and 1163 ST infection cases reported in 1992.
- Utilized case/time diagrams and district-level breakdowns for cluster identification.
- Subdivided identified "Episodes of Increased Case Frequency" (EICFs) into outbreaks and case accumulations (ACCs).
Main Results:
- Identified three SE transmission categories: outbreaks (12%), ACCs (37%), and sporadic cases (largest proportion).
- SE-ACCs were geographically larger and lasted longer than SE outbreaks.
- SE-ACCs involved more individuals on average than SE outbreaks, sharing outbreak characteristics.
Conclusions:
- Salmonella enteritidis case accumulations (ACCs) represent an important, distinct element of SE epidemics, differing from traditional outbreaks.
- SE-ACCs warrant further investigation and development of early detection methods.
- Salmonella typhimurium (ST) episodes showed no significant difference between outbreaks and ACCs, with shorter durations and fewer cases compared to SE.