Allergen avoidance in a day-care center

Area of Science:

• Environmental Health
• Allergen Exposure
• Indoor Air Quality

Background:

• Furred pets are primary sensitizers for asthmatic children.
• Poor ventilation and high humidity increase indoor pet allergen accumulation.
• Indirect pet contact contributes to allergen exposure.

Purpose of the Study:

• To assess the impact of renovation and allergen reduction strategies on cat (Fel d I) and dog (Can f I) allergen levels in a day-care center.
• To evaluate changes in allergen concentration and total amount after implementing new ventilation, cleaning, and pet avoidance measures.

Main Methods:

• Dust samples collected from various surfaces before and after extensive renovation over 12 months.
• Quantification of Fel d I and Can f I using sandwich ELISA.
• Comparison of allergen levels considering both concentration (per gram of dust) and total amount (per sampling area).

Main Results:

• A more pronounced reduction in the total amount of cat and dog allergen per sampling area compared to concentration per gram of dust.
• Mean cat and dog allergen concentrations decreased six-fold and ten-fold, respectively, post-renovation.
• Total cat allergen significantly decreased within a year, and total dog allergen decreased over ten-fold after the first sampling.

Conclusions:

• Combined interventions, including mechanical ventilation, floor ventilation, rigorous cleaning, and pet avoidance, effectively reduce cat and dog allergen exposure in day-care settings.
• Renovated centers with these measures offer significantly lower pet allergen exposure compared to typical day-care environments.
• These findings suggest a practical approach to mitigate allergen exposure for children with asthma in group care settings.