A 3-month-old child with subfebrile body temperature and rhinitis is observed pallor, cyanosis of the nasolabial triangle, pronounced expiratory dyspnea, swollen chest, dry cough, involvement of accessory muscles in respiration. Percussion established: above the lungs box sound, during auscultation on the background of elongated exhalation audible scattered dry and fine-bubble wet rales on both sides. In the blooddetected: Hb - 112 g/l, erythrocytes - 3.2 × 1012/ l, leukocytes - 15.4 × 10 ^ g/l, lymphocytes - 72%. What is the previous diagnosis?