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Methenamine silver stain of lung infected with A fumigatus. (All from the placebo group) magnification, ×400 (left) and ×800 (right), a lot of hyphae within the lesions of necrosis can be observed (arrows). Hexamethylene tetramine silver staining exhibited considerable hyphae invasion into pulmonary alveoli and interstitium at 72 h. Only few conidia were found at 72 h.
