Hepatitis B Infection in Norway: 1992-2009
Author Information
Author(s): Rimšelienė Gražina, Nilsen Øivind, Kløvstad Hilde, Blystad Hans, Aavitsland Preben
Primary Institution: Norwegian Institute of Public Health
Hypothesis
To assess the validity of current risk groups for hepatitis B in Norway and recommend preventive measures.
Conclusion
IDUs remain the largest risk group for acute hepatitis B, and increased immigration from high endemic countries is linked to peaks in chronic hepatitis B cases.
Supporting Evidence
- The annual incidence of acute hepatitis B ranged from 0.7 to 10.6 per 100,000.
- 64% of acute hepatitis B cases were among IDUs.
- Chronic hepatitis B was more likely to be diagnosed among immigrants than Norwegians.
- The risk of acquiring acute hepatitis B was highest in people aged 20-29.
- There were two peaks of chronic hepatitis B cases in 2003 and 2009.
Takeaway
This study looked at hepatitis B cases in Norway over 17 years and found that drug users are the most affected group, while immigrants from countries with high hepatitis B rates are also at risk.
Methodology
Data was collected from the national surveillance system for hepatitis B, analyzing reported cases by year, sex, age, and geographical location.
Potential Biases
Potential bias due to incomplete data on sexual orientation and exposure routes.
Limitations
Data on exposure was unknown for 83% of chronic hepatitis B cases, and there was under-reporting of acute cases.
Participant Demographics
The study included cases from various demographics, with a focus on IDUs and immigrants.
Statistical Information
Confidence Interval
95%
Digital Object Identifier (DOI)
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