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An occupational disease is a disease which is caused by work, or is related to work,, or results from a pre-existing condition being aggravated by work, or has work as part of the multiple aetiology of the disease
Work = job + General working conditions + work environment
Occupational factors affecting ill-health
Physical, biological, chemical, psychosocial
To diagnose: A cause-effect relationship must be established with reasonable certainty.
risk assessment
Health hazard control Seq : recognisition of health effect -> diagnosis of illness -> Discovery of environmental cause -> monitoring and control of cause -> monitoring of health of workers.

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Intermediate- mixed rxn = combination of above
FVC : FEV < 75% we can measure asthma
Rate of deposition depends on particle size
Pattern of deposition for spherical particles
Particles between 2~7 micro meter most are deposited therefore = vital particle size
Pattern of deposition for spherical particles
X -> particle size
Y-> per cent deposited
For non-spherical fibers- rates depends on fiber size
Pnemoconiosis
The generic name used to describe the accumulation of dust in the lungs and the tissue response to its presence
Non-fibrogenic
This involves the formation of small, round, dense particles on x-ray film device result to from paeivascular collections of dust, but no fivrosis is ovserved

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