Researchers puzzled by Swedish chlamydia mystery

Two years ago, the diagnosed rate of chlamydia in Sweden plummeted 25 percent.

That, in and of itself, was puzzling as there had been no public health interventions or sudden changes in the sexual mores of the Swedish populace.

Researchers soon identified a new strain of the bacteria, which was missing the key snippet of DNA that diagnostic tests from Roche and Abbott used to detect Chlamydia trachomatis.