The recognition of Chlamydia pneumoniae as a separate species within the Chlamydia genus is relatively recent , but clues in literature for the existence of this agent date back to at least 50 years ago. In the paper Atypical pneumonia and psittacosis published on the Journal of Clinical Investigation in 1943 , Smadel described cases of pneumonia with a positive complement fixation test for psittacosis but no history of past contact with birds. The Author concluded that “it appears desirable to search for a humanized strain (...) which is moderately contagious for man and which is transmitted from man to man by way of the upper respiratory route”. Smadel’s intuition remained “vox clamantis in deserto”.
KeywordsHelsinki Heart Study Respiratory Route Chlamydia Psittaci Unusual Strain Mild Pneumonia
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