Hepatitis B
The clinical manifestations of acute hepatitis B infection in adults range in severity from minimal symptoms to fulminant hepatitis (in less than 1 percent of cases). Adults may experience the insidious onset of fever, malaise, abdominal discomfort and anorexia with jaundice or elevated serum aminotransferase levels.

Acute hepatitis B infection in the first few months of life seldom causes clinical disease, and symptoms or signs are less common in children than in adults.

Hepatitis C
Hepatitis C infection is often asymptomatic but may present as an illness with variable symptoms of lethargy, anorexia and jaundice.

The current definition for acute hepatitis C includes cases where there has been documented seroconversion within a 12-month period, even in the absence of clinical illness.

Only acute cases of hepatitis C are notifiable.

Hepatitis NOS
An illness with variable symptoms including fever, malaise, anorexia and nausea with jaundice and/or elevated serum aminotransferase levels. Hepatitis G has no recognised disease sequelae.