secondly , the experiments show that bacillus influenzae infection of the mucous membranes of the upper respiratory tract may spread by continuity to the paranasal sinuses , setting up an acute sinusitis , that it spreads readily to the lower respiratory tract , producing a tracheobronchitis and permitting the ready invasion of secondary bacteria , and that it may penetrate as far as the terminal bronchioles , alveolar ducts , atria , and alveoli , there setting up a bronchiolitis and true bronchopneumonia .
C0030471
paranasal sinuses
C0149512
acute sinusitis