the determinants of an unfavourable prognosis for asthma seem to be the same as those for other types of occupational asthma due to low molecular weight compounds ( i.e . red cedar asthma ) : long duration of exposure before the onset of asthma , long duration of symptoms before diagnosis , airway obstruction , and dual airway response after specific challenge tests .
C0264423
occupational asthma
C0004096
asthma