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Chlamydial pneumonia. Frontal chest X-ray of the cloudy lungs of a 45-year-old patient with chlamydial pneumonia. This lung infection is caused by the bacterium Chlamydia sp. Pneumonia causes an inflammation of the lungs. Symptoms include chest pain and fever. The tiny air-sacs (alveoli) in the lower lobe of the right lung have filled with pus and fluid (exudate), which hinders gas exchange. If left untreated, pneumonia leads to acute respiratory distress and blood poisoning (sepsis). Treatment depends on which type of Chlamydia has caused the infection but usually involves the use of antibiotics.
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