Criteria
Degree of dehydration (World Health Organization [WHO])[43]
The WHO classifies dehydration on a scale of 1-3:
No dehydration; with no signs or symptoms
Some dehydration; which is indicated by two or more of these signs: thirst, restless or irritable behavior, decreased skin elasticity, and sunken eyes
Severe dehydration; in which symptoms become more severe, indicated by two or more of these signs: diminished consciousness/lethargy, sunken eyes, unable to drink or drink poorly, and skin pinch goes back very slowly (≥2 seconds).
Commonly applied case definition in foodborne disease outbreaks[2]
An epidemiologic tool used to count cases in a foodborne disease outbreak; it is not used to guide clinical practice.
Confirmed cases: have a positive laboratory result (isolation of the causative agent or positive serologic test). This case definition has high specificity.
Probable cases: have the typical clinical features of the illness, but without laboratory confirmation.
Possible cases: have fewer or atypical clinical features. This case definition has high sensitivity.
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