In this case history, the 49 year-old man handled the parakeet with respiratory illness on the month February 7. On March 9, he experienced extreme pain in his legs, followed through severe chills and headaches. On March 16, he had chest pains, diarrhoea, and cough, and his temperature was 40°C. Proper antibiotics were administered on March 17, and his fever subsided in 12 hours. He continued taking antibiotics for 14 days. Recognize each period in pattern of disease that he experienced.

Note: The disease is psittacosis. Can you find out the etiology?

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