The level of airborne endotoxin and ,1-3 glucan was determined in a number of daycare centers and in a school before and after restoration work. Interviews were performed with the personnel and bronchial reactivity was measured. In locations with glucan, there was an excess of symptoms of irritation, fatigue and headache. The extent of symptoms decreased after renovation in the school. Bronchial reactivity was slightly higher among persons working in daycare centers where glucan was present.