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Bacterial colony in the lung. Section of lung from a Staphylococcus aureus infected pig killed 5 h after inoculation (pig no. 6) showing a bacterial colony without any inflammatory reaction and identified by fluorescent in situ hybridisation (insert). The in situ hybridisation was performed first and the bacterial colony photographed. Then the section was stained with haematoxylin and the same colony identified and a new photo taken. Bar = 20 μm.
