Abstract
To the Editors: The cross-sectional study by Sripaiboonkij et al 1 on 167 milk powder factory workers from four factories in Thailand reported an increased risk of developing work related symptoms compared with office workers. Milk protein allergy as a cause of occupational asthma is well recognised. In addition, many of the studied workers were exposed to the vitamin mixtures used to fortify milk powder. Workers exposed to vitamins had poorer lung function, with significant reductions in forced vital capacity, and an increased risk of nasal, skin and eye symptoms. Breathlessness and nasal symptoms were increased in packing workers, who were also exposed to vitamins in their work. Sripaiboonkij et …
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