ROTAVIRUS

RESPONSE PROTOCOL FOR NSW PUBLIC HEALTH UNITS

RESPONSE SUMMARY

Last updated: 12 October 2010

1 Reason for surveillance

To monitor the epidemiology of the disease and so inform better prevention strategies.

2 Case definition

A confirmed case requires laboratory definitive evidence.

Laboratory definitive evidence

Detection of rotavirus antigen by enzyme immunoassay (EIA), latex agglutination, electron microscopy (EM), reverse transcription- polymerase chain reaction (RT- PCR) or polyacrylamide gel electrophoresis (PAGE) in stool.

3 Notification criteria and procedure

Rotavirus infection is notified by laboratories on microbiological confirmation (ideal reporting by routine mail).

Only confirmed cases should be entered onto the Notifiable Condition Information Management System (NCIMS).

4 The disease

Infectious agent
Rotavirus is a virus in the Reoviridae family. Group A is common in humans; group B in uncommon in humans but has caused large outbreaks in China.

Mode of transmission
Primarily faecal oral contact and respiratory spread may be possible.

Timeline
The typical incubation period is approximately 24 to 72 hours.

Rotavirus is infectious for the duration of the acute stage of illness and later while the virus shedding continues. This usually lasts from 4 to 8 days but can be up to 30 days after onset of illness.

Clinical Presentation
Rotavirus can present as a range of illnesses from mild, watery diarrhoea of limited duration to severe, dehydrating diarrhoea with vomiting, fever, and shock. Symptoms generally resolve in 3 to 7 days.

5 Managing Notifications

Response Times

Data Entry
Within 3 working days of notification enter on NCIMS confirmed cases only.

For notified cases with a date of birth after 1 May 2007, ascertain their vaccination status from ACIR and include in NCIMS.

Response Procedure
None routinely. When a cluster is reported in an institutional setting follow the "Gastroenteritis in an Institution" response protocol.