Commercially prepared extracts of 6 different grass pollens, rye, fescue, sweet vernal, june, velvet, and redtop were compared for their skin reactivity, rye Group I allergen content, and protein nitrogen units (PNU) content claimed by the manufacturer and redetermined at the time the extracts were used. There was a high correlation between skin reactivity and Group I allergen content. There was no correlation between the PNU claimed and either skin reactivity or Group I allergen content. The PNU determined at the time the extracts were used showed an improved correlation with biologic activity.
ASJC Scopus subject areas
- Immunology and Allergy