Description: The Chlamydia (Chlamydophila) pneumoniae, IgG and IgM test is a serum test that employs immunofluorescence to detect IgG and IgM antibodies to Chlamydia pneumoniae in human serum. C pneumoniae has been implicated as one of the agents of atypical pneumonia and may be responsible for as many as 10% of all hospitalized and outpatient cases of pneumonia. Additionally, it may also be responsible for sinusitis and otitis.