Abstract:
BACKGROUND:Our goal was to investigate the epidemiological characteristics and etiology of an outbreak of food-borne disease caused by Norwalk-like viruses, genogroup II. PATIENTS AND METHOD:We performed a historical cohort study on the consumption of 21 food items and clinical symptoms. We assessed RNA Norwalk-like viruses by RT- PCR in stool samples from 5 patients and 2 food-handlers. The potential involvement of each food item was assessed by relative risk at 95% confidence intervals (CI). RESULTS:The overall attack rate was 70.0% (7/10). The median incubation period was 35.0 hours. Symptoms included: vomits 85.7% (6/7), fever 85.7% (6/7) and diarrhoea 71.4% (5/7). Four food items were involved [fish (RR = 1.7; CI 95% 0.9-3.3); 'selection of cold meats' (RR = 1.6; CI 95% 0.9-2.7); yoghurt (RR = 1.5; CI 95% 1.0-2.4) and lamb (RR = 1.3; CI 95% 0.6-3.0)]. Three stool sample gave positive results for Norwalk-like viruses genogroup II. Important oversights in food-handlers' work were detected. CONCLUSIONS:RT-PCR enabled us to confirm the etiology of this outbreak as Norwalk-like viruses genogroup II. Although patients recovered quickly, the outbreak caused considerable public alarm.
journal_name
Med Clin (Barc)journal_title
Medicina clinicaauthors
Godoy P,Prat A,Alsedà M,Torres J,Domínguez A,Salleras Ldoi
10.1016/s0025-7753(02)73298-3keywords:
subject
Has Abstractpub_date
2002-06-08 00:00:00pages
13-5issue
1eissn
0025-7753issn
1578-8989pii
S0025-7753(02)73298-3journal_volume
119pub_type
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