Test Details: Chlamydia pneumoniae is a bacterium that infect human beings causing respiratory disease in elderly and in weak patients. Symptoms include running nose, fever, fatigue, loss of voice, sore throat, cough and headache etc. Chlamydia testing includes screening for the specific IgA, IgM and IgG antibodies produced in response to bacteria. IgM signifies a current infection with chlamydia. IgG signifies a past chlamydial infection.