<prompt> Which one of the following statement regarding Chlamydia pneumoniae is TRUE?Fifteen serovars have been identified as human pathogensIt is transmitted through the inhalation of bird excretaThe cytoplasmic inclusions present in the sputum specimen are rich in glycogenThe group specific antigen is responsible for the production of complement fixing antibodies  <response>: Chlamydiae possess group specific antigens. These are heat-stable lipopolysaccharides with 2-keto-3-deoxyoctanoic acid as an immunodominant component. Antibody to these genus-specific antigens are detected by complement fixation CF and immunofluorescence. Ref: Harrisons Internal Medicine, 18th Edition, Chapter 176; Jawetz, Melnick and Adelbergs Medical Microbiology, 25th Edition, Chapter 27 