ALLERGENS IN SCHOOL DUST .1. THE AMOUNT OF THE MAJOR CAT (FEL D I) AND DOG (CAN F I) ALLERGENS IN DUST FROM SWEDISH SCHOOLS IS HIGH ENOUGH TO PROBABLY CAUSE PERENNIAL SYMPTOMS IN MOST CHILDREN WITH ASTHMA WHO ARE SENSITIZED TO CAT AND DOG

Background: We investigated the levels of Fel d I and Can f I in dust from tables, chairs, and floors in 29 classrooms in four Swedish schoo ls. Methods: School authorities were questioned about building charact eristics, students were interviewed about their health and exposure to animals, and cleaning personnel were asked about methods and frequenc y of cleaning. Dust samples were taken from floors and horizontal surf aces of chairs and tables in all classrooms during a 6-week period. Re sults: Higher amounts of Fel d I were found on chairs (geometric mean, 953 ng per gram of dust) than on tables (525 ng/gm) and floors (134 n g/gm). The concentration of Can f I (5.3 ng/gm) on chairs was 2 to 20 times higher than Fel d I. The concentration of Can f I (200 ng/gm) in dust from floors was twice as high as that of Fel d I. The concentrat ion of Can f I on chairs was within the range previously found by othe r investigators in houses with dogs. Conclusions: Since the levels of both Fel d I and Can f I were much higher on chairs than on floors, we hypothesize that allergen is brought to schools on the clothes of stu dents and teachers. We conclude that the levels of the two major aller gens from furred pets (i.e., Fel d I and Can f I) in Swedish schools a re probably high enough to sensitize children and to induce asthma in most children who are allergic to cats or dogs.