"Flour dust" refers to dust coming from fmely milled or othenvise processed cereal. Hypersensitivity reactions as well as irritant syrnptoms caused by flour dust constitute a well recognized occupational problem world-wide. Most data on flour dusts have been derived fiom studies on wheat (Triticum sp.) and rye (Secale cereale), and to a lesser extent on barley (Hordeum sp.) and oats (Avenea sat...