Pulmonary function declines. E. Reversibility of damages or health problems. It is likely that some of the lung problems experienced by swine workers do cause irreversible damage. However, there are unpublished anecdotal cases observed that some acute lung illnesses are probably reversible. It should be realized that reversible health problems should still be prevented.
Simple bronchitis is likely reversible without further occupational exposure.
Chronic bronchitis may improve with elimination or reduction of exposure, but may be a permanent condition. Chronic bronchitis that has progressed to chronic obstructive pulmonary disease may improve with exposure control, but will not reverse to baseline. Asthma will improve with exposure control, but will likely persist even after cessation of exposure. When to quit. The major concern for work restriction in swine confinement workers are, periodic acute airways obstruction, progressive decline in lung function, and episodes of reactive airway disease.