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Do all outbreaks really happen on a Friday afternoon?
1South and West Devon Health Authority, Lescaze Offices, Shinner's Bridge, Dartington TQ9 6JE. sanjay.kinra@sw-devon-ha.swest.nhs.uk
Communicable Disease and Public Health
|March 31, 2001
Summary
Disease control professionals often believe outbreaks occur on Friday afternoons. However, a survey of foodborne illness outbreaks found no evidence to support this claim, suggesting it is a myth.
Area of Science:
- Epidemiology
- Public Health
- Infectious Disease Control
Background:
- Communicable disease control professionals commonly report a belief that disease outbreaks, particularly foodborne illnesses, tend to occur on Friday afternoons.
- This anecdotal observation has persisted within the field, potentially influencing perceptions of outbreak timing and response.
Purpose of the Study:
- To investigate the validity of the claim that foodborne illness outbreaks disproportionately occur on Friday afternoons.
- To empirically test a commonly held belief within the communicable disease control community.
Main Methods:
- A retrospective survey and analysis of reported foodborne illness outbreaks.
- Data collection focused on the day of the week each outbreak was identified or reported.
Main Results:
- Analysis of the surveyed foodborne illness outbreaks did not reveal a statistically significant increase in occurrences on Friday afternoons.
- The distribution of outbreak reports across the days of the week was found to be relatively even, contradicting the prevailing belief.
Conclusions:
- The belief that foodborne illness outbreaks predominantly happen on Friday afternoons is not supported by empirical data.
- This finding suggests that the perceived clustering of outbreaks on Friday afternoons is likely a myth, not a reflection of actual epidemiological patterns.