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International News

Chlamydia Trachomatis Infections in Norway, 1986 to 2006, Surveillance Data

January 23, 2009

"The number of Chlamydia trachomatis infections in Norway has been increasing for the last years. A new and enhanced surveillance system was implemented in 2005 to meet the challenges faced by the increasing number of cases," the report's authors explained.

The new surveillance system is laboratory-based and includes data collected once a year from all laboratories on the total number of tests performed and all diagnosed cases from the preceding year. For each case, the date of diagnosis, birth year, sex, and municipality of residence are recorded.

All laboratories reported data as required by 2006. The authors observed an increase in chlamydia cases diagnosed yearly in Norway during the last years. In 2006, chlamydia incidence was 4.6 per 1,000 population. The proportion of positive tests has increased from 6.0 percent in 2000 to 7.7 percent in 2006. During that same period, the annual number of tests increased by 13.5 percent. Surveillance data from 2006 found the highest incidence rates among women ages 15-24, men ages 20-24 and people living in the two northernmost regions of Norway.

"The year 2006 had the highest level of diagnosed cases ever in Norway. To better interpret the observed trend, a voluntary system will be introduced in 2007 to collect test rates by age, gender and geography. There is a need to evaluate current and new strategies to target the group of asymptomatic and untreated young people," the authors concluded.

Back to other news for January 2009

Adapted from:
Sexually Transmitted Diseases
01.2009; Vol. 36; No. 1: P. 17-21; Hilde Kløvstad, M.P.H., R.N.; Preben Aavistland, M.D.

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This article was provided by CDC National Prevention Information Network. It is a part of the publication CDC HIV/Hepatitis/STD/TB Prevention News Update.
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