Environmental presence is not disease
Aspergillus occurs indoors and outdoors, and many people inhale spores without becoming ill. Individual susceptibility matters, particularly with immunosuppression or lung disease. Detecting the fungus in a sample therefore neither diagnoses aspergillosis nor proves occupational causation. Interpretation should combine environmental conditions, tasks and clinical assessment, avoiding conclusions based solely on an isolated microbiological count without an appropriate question and supporting context.
Not every effect is an infection
The genus can be associated with different infectious and allergic manifestations. Invasive infection is not the same as an allergic response or hypersensitivity pneumonitis. This distinction affects medical investigation and environmental assessment. The prevention professional supplies exposure information but should not assign a diagnosis from the type of dust or a photograph of the workplace alone, without qualified clinical evaluation.
Tasks that disperse spores
Handling mouldy plant material, disturbing organic waste or working on contaminated materials can release bioaerosols. Observe unloading, cleaning and maintenance as well as normal production. Identify moisture, storage conditions and points where dust reaches others. Assessment should include task changes and occasional operations, which may differ from conditions seen during a brief visit. A clean appearance during routine operation does not describe every intervention.
Control sources and dispersion
INSST recommends avoiding dampness and condensation, maintaining ventilation and installations, and reducing dust- or bioaerosol-generating processes. Where generation cannot be avoided, enclosure, isolation and local extraction should be assessed. Respiratory protection supplements controls according to assessment; it cannot by itself solve storage conditions encouraging mould. Verify that interventions do not move dust towards occupied areas or contaminate previously clean materials and equipment.
Susceptibility and medical consultation
Workers with conditions increasing vulnerability need confidential occupational-health assessment to adapt measures where appropriate. Persistent cough, breathing difficulty or other symptoms require clinical evaluation informed by tasks and materials handled. Self-medication with antifungals is inappropriate. Aspergillosis is not ordinarily transmitted between people; the main preventive focus is the environmental source, rather than stigmatising the person diagnosed or assuming colleagues become infected through routine contact.
Evidence for reviewing prevention
Document materials, moisture, operations, controls and recent changes alongside clinical information that may legitimately be shared. Sampling needs a defined question and interpretation criteria; no generic number makes every environment safe for every person. Review control effectiveness at the process level and coordinate with specialists when the setting or individual susceptibility requires additional protection. A microbiological result is one input, not a complete risk assessment.
