Table 2

Outbreak and case-defining criteria in all patients who experienced diarrhea and/or vomiting during the outbreak with norovirus gastroenteritis

Norovirus PCR
Positive (n = 11)Negative (n = 15)
Outbreak criteria5   
    Duration of symptoms, days, median (range)* 7 (2-36) 6 (1-58) 
    Patients with vomiting, n (%) 8/11 (73) 11/15 (73) 
    Patients with stool specimens negative for bacterial pathogens, n (%) 8/11 (73) 7/15 (47) 
Case-defining criteria6   
     ≥ 2 episodes of vomiting, n (%)* 8/11 (73) 6/15 (40) 
     ≥ 3 episodes of diarrhea, n (%)§ 11/11 (100) 10/15 (67) 
    Both criteria fulfilled during a 24-hour period, n (%)§ 7/11 (64) 3/15 (20) 
Norovirus PCR
Positive (n = 11)Negative (n = 15)
Outbreak criteria5   
    Duration of symptoms, days, median (range)* 7 (2-36) 6 (1-58) 
    Patients with vomiting, n (%) 8/11 (73) 11/15 (73) 
    Patients with stool specimens negative for bacterial pathogens, n (%) 8/11 (73) 7/15 (47) 
Case-defining criteria6   
     ≥ 2 episodes of vomiting, n (%)* 8/11 (73) 6/15 (40) 
     ≥ 3 episodes of diarrhea, n (%)§ 11/11 (100) 10/15 (67) 
    Both criteria fulfilled during a 24-hour period, n (%)§ 7/11 (64) 3/15 (20) 
*

Not significant.

Three patients without microbiological testing.

Four patients without microbiological testing, 3 patients with a positive test result for Clostridium difficile toxin, and 1 patient with enhanced number of yeasts in a stool specimen.

§

P ≤ .05.

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