Date: 7 May 2013
Copyright: n/a
Notes:
Colonies on CYA 40-60 mm diam, plane or lightly wrinkled, low, dense and velutinous or with a sparse, floccose overgrowth; mycelium inconspicuous, white; conidial heads borne in a continuous, densely packed layer, Greyish Turquoise to Dark Turquoise (24-25E-F5); clear exudate sometimes produced in small amounts; reverse pale or greenish. Colonies on MEA 40-60 mm diam, similar to those on CYA but less dense and with conidia in duller colours (24-25E-F3); reverse uncoloured or greyish. Colonies on G25N less than 10 mm diam, sometimes only germination, of white mycelium. No growth at 5°C. At 37°C, colonies covering the available area, i.e. a whole Petri dish in 2 days from a single point inoculum, of similar appearance to those on CYA at 25°C, but with conidial columns longer and conidia darker, greenish grey to pure grey.
Conidiophores borne from surface hyphae, stipes 200-400 µm long, sometimes sinuous, with colourless, thin, smooth walls, enlarging gradually into pyriform vesicles; vesicles 20-30 µm diam, fertile over half or more of the enlarged area, bearing phialides only, the lateral ones characteristically bent so that the tips are approximately parallel to the stipe axis; phialides crowded, 6-8 µm long; conidia spherical to subspheroidal, 2.5-3.0 µm diam, with finely roughened or spinose walls, forming radiate heads at first, then well defined columns of conidia.
Distinctive features
This distinctive species can be recognised in the unopened Petri dish by its broad, velutinous, bluish colonies bearing characteristic, well defined columns of conidia. Growth at 37°C is exceptionally rapid. Conidial heads are also diagnostic: pyriform vesicles bear crowded phialides which bend to be roughly parallel to the stipe axis. Care should be exercised in handling cultures of this species.
Images library
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PtDS2 –Repeated chest infections arrested by itraconazole therapy in ABPA and bronchiectasis
DS2 developed asthma age 24 and now aged 62. From about age 30 she started getting repeated chest infections and a few years later ABPA and bronchiectasis was diagnosed. Infections continued requiring multiple courses of antibiotics annually. At one point DS2 developed a pneumothorax, possibly because of excess coughing. She has chronic rhinitis and mannose binding lectin deficiency. In May 2011, she started itraconazole therapy, and has needed no antibiotic courses for her chest since. Her rhinitis with sinusitis occasionally bothers her. She is delighted to have gone 18 months with no chest infections.
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Aspergillus hyphae (arrow) in the lumen without invasion of the necrotic bronchial wall (*) (Nicod 2001).
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fibrinonecrotic material (arrow) from the airway shown in A, with subocclusion of the bronchial lumen (*)
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Fibrinous or pseudomembranous bronchitis (arrow) with subocclusion of the airways (* indicates subocclusion of the airways by pseudomembranes)
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Bronchoscopic biopsy demonstrated septate hyphae with branching at 45o (methenamine silver stain ×400).
