This chapter details a case study of 44-year-old Caucasian woman who was presented with 10-day history dry cough, exertional dyspnea, myalgia and fever. Symptoms persisted despite having completed course amoxicillin erythromycin. She an ex-smoker 15 pack years living in rented accommodation mold bird exposure, canary as pet. On the basis clinical hematological findings, cold antibody-induced he...