'Chlamydia Monday' in Sweden.

The number of reported cases of Chlamydia trachomatis infections has increased in Sweden in the last decade, as in many other European countries [1]. After a temporary fall in the number of cases reported in Sweden in 2006, due to the spread of a new variant that was not detectable with some of the test methods used at the time, 2007 showed a record high of over 47,000 reported cases [2].