FIG 7.

PTAH staining of lung tissue sections from 6- to 9-month-old baboons infected with B. pertussis. Six- to 9-month-old baboons were challenged with B. pertussis, and PTAH-stained slides were prepared as described in Materials and Methods. Representative images are presented. Lung tissue samples were collected from uninfected animals (A) and from infected animals at day 2 postchallenge (B) and day 7 postchallenge (C), and intra-alveolar fibrin deposition is shown in dark blue/purple (white arrows). Magnifications, ×200.