Mixed Viral Gastroenteritis Caused by Rotavirus and Norovirus in a Temporary Shelter, Suan Phueng District, Ratchaburi Province, Thailand, February - March 2013

Abstract

Background: Acute viral gastroenteritis occurred in a temporary shelter in Suan Phueng District, Ratchaburi Province. An outbreak investigation was initiated to confirm diagnosis and outbreak, to determine the etiology, to identify source of infection and to recommend specific control measures.
Methods: We reviewed medical record and interviewed cases and conducted active case finding by define case definition. Environmental survey was carried out by collected 11 stool and rectal swab samples from cases and 14 water supply and ice samples from the shelter to test virus by PCR. Results: Total 111 cases met case definition and attract rate was 1.5%. Most of the cases were in age group 0-1 years approximately 13.63 % with median age was 3 years (range 11 days – 65 years). The epidemic curve demonstrated a continuous common source. The stool and rectal swabs were positive Norovirus and Rotavirus by RT-PCR and PAGE respectively. And the natural water supply before treatment process was contaminated by Rotavirus.
Conclusions: We recommended to improvement the water treatment program and gave education about personal hygiene and sanitation for preventive measures. Continuing surveillance for a new case particularly high incident zone for 14 days was recommended.