Apr 27, 2012
hi doctor recently my friend did a chlamydia infection test it came with two results lgg psitive lgm negative what's the diffrence between them and if there is any other disease related to chlamydia thank u
Response from Dr. Young
Hello and thanks for posting.
Chlamydia infections generally come in two types, from two different species of bacteria. Chlamydia pneumonia causes respiratory tract infections, whereas Chlamydia trachomatis causes a sexually transmitted infection.
The tests results that you refer to are antibody tests-- the IgM is an antibody produced transiently after the initial exposure (in this case, to Chlamydia). IgM levels usually fade to negative in a month or two. IgG antibodies are produced shortly after the initial IgM phase and persist. They are indicative of previous exposure or infection, but not indicative necessarily of active illness.
We typically don't use antibody tests for Chlamydia, but rather use nucleic acid amplification or PCR tests to detect the live bacteria.
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