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a 6-month-old male, presents to the emergency department with complaints of shortness of breath, fevers, chills, and coughing in past 3 days. he has body temperature 38, 7°c, productive frequent cough, lost of appetite and apathy. he was treated by trimethoprim/sulfamethoxazole, antipyretic. the general condition of child is moderate. his skin is pale, clean, mild perioral cyanosis. respiratory rate 48/min., at weeping an auxiliary musculature takes part in breathing. on percussion: reduction sound over the right lungs. on auscultation: reathing is hard, moist small-vesicle wheezes are hearkened from right sides. cbc: hb-110 g/l, leucocytes 10,0x109/1, speed of settling of erythrocytes - 35 mm/hour. please, form the preliminary diagnosis. create plan of examination of the patient and interpret cbc list main principles of therapy.