Skip to main content

Table 2 Kaplan's criteria (2) for suspecting an outbreak is due to norovirus compared to features of the gastro-enteritis outbreak in Gran Canaria 2002.

From: Gastro-enteritis outbreak among Nordic patients with psoriasis in a health centre in Gran Canaria, Spain: a cohort study

Kaplan criteria

How our study meet these criteria

1. Vomiting in > 50% of cases

69% vomited

2. Duration of illness 12–60 h

85% had duration of illness -1–72* h

3. Incubation period of 15–36 h

Food items eaten within 48 h are possible vehicles

4. Bacterial pathogens are not identified

22 stool samples found negative

  1. * Duration of symptoms was asked for in terms of days. Only time of onset and not hourly information on recovery were collected. We therefore had to use 1–72 h instead of 12–60 h.