ARCHIVED - Hepatitis A
Nationally notifiable from 1927-1958, 1969 onwards
1.0 National Notification
Only confirmed cases of disease should be notified.
2.0 Type of Surveillance
Routine case-by-case notification to the federal level
3.0 Case Classification
3.1 Confirmed case
Laboratory confirmation of infection in the absence of recent vaccination:
- detection of immunoglobulin M (IgM) antibody to hepatitis A virus (anti HAV)
- Acute clinical illness (see section 5.0)
- An epidemiologic link to a person with laboratory-confirmed hepatitis A infection.
3.2 Probable case
Acute clinical illness in a person without laboratory confirmation of infection who is epidemiologically linked to a confirmed case
4.0 Laboratory Comments
IgM positive results can be a true positive but reflect a remote infection, as HAV-IgM can remain detectable for years after an acute infection because of trailing IgM or the non-disappearance of anti- HAV IgM after recent infection. Acute/recent infection should be confirmed with clinical history symptoms and by repeat titre after 7 to 10 days.
5.0 Clinical Evidence
Acute clinical illness is characterized by discrete onset of symptoms, including fever, malaise, anorexia, nausea and abdominal pain followed by jaundice or elevated aminotransferase levels within a few days.
6.0 ICD Code(s)
6.1 ICD-10 Code(s)
- Hepatitis A with hepatic coma
- Hepatitis A without hepatic coma [Hepatitis A (acute)(viral) not otherwise specifi ed (NOS)]
6.2 ICD-9/ICD-9CM Code(s)
- Viral hepatitis A with hepatic coma
- Viral hepatitis A without mention of hepatic coma
7.0 Type of International Reporting
Probable case definitions are provided as guidelines to assist with case finding and public health management, and are not for national notification purposes.
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