Figure 3From: Chlamydophila spp. infection in horses with recurrent airway obstruction: similarities to human chronic obstructive diseaseImmunohistochemistry of equine lung tissue in RAO. In RAO, animals with severe bronchiolitis (note the striking intraluminal accumulation of neutrophils and macrophages) most of the bronchiolar epithelial cells carry CP antigens (brown staining, original magnification 20×).Back to article page