[Morphometric study of the bronchopulmonary lymphoid system in the normal mouse and the mouse infected with influenza virus].

Morphometric study of mouse bronchus-associated lymphoid tissue (BALT) using an image analyser and histological sections at close and regular intervals was carried out in lungs of control and influenza infected mice two to three months old. The mean area of BALT did not reach 0,1 p. 100 of the whole mean area of examined lung sections in control mice; this percentage was significantly greater one month after primary exposure to influenza virus.