Figure 1.
(A) Lung histology of fatal human H5N1 disease stained with Haematoxylin & Eosin showing increased cellular inflammation within the alveoli compared to normal lung. (B) Immunohistochemistry for the macrophage marker CD68 (brown) shows increased numbers of macrophages infiltrating the lung tissue. (C) The histological appearance and alveolar macrophages shown by CD68 immunohistochemistry in a control lung is shown for comparison. Magnification × 200.