A 3-year-old child has a cough and runny nose. Two other family members have the same signs. On the third day after the onset of the disease, the cough intensified and became dry and persistent. The temperature increased to 37.8°C. The act of breathing involves the auxiliary muscles. Percussion produces a banbox resonance bilaterally in the lungs. Breathing is harsh, expiration is prolonged, there are moderate and large bubbling wheezes. The wheezes are diffuse and mostly wet, though in some places they are dry. Make the right diagnosis: