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  • Title: The biological potency of different extracts for sublingual immunotherapy assessed by skin prick tests.
    Author: Rossi R, Monasterolo G, Passalacqua G.
    Journal: Eur Ann Allergy Clin Immunol; 2010 Jun; 42(3):112-4. PubMed ID: 20648773.
    Abstract:
    The standardization of allergen extracts is of primary relevance to the clinical efficacy. Biological standardization procedures are widely used in the commercial production of vaccines. We tested, in grass-allergic patients, the potency of three different grass extracts for sublingual immunotherapy by means of skin prick tests. Specific IgE against Phl p 1, 2, 4, 5, 7, 11 and 12 were also assayed. Allerslit and Sublivac were directly applied as skin test. Grazax, was prepared by dissolving two tablets in 2 mL saline. Thirty-three subjects (mean age 38.8) were studied. The skin response was significantly different among extracts, decreasing from Allerslit to Grazax (t test < 0.01), but all the extract produced a skin response greater than histamine. All the subjects had specific IgE to Phl p 1 and Phl p 4 but 24% did not have specific IgE to Phl p 5. In those subjects the skin response to the three extracts did not differ from that of Phl p 5-positive subjects. Our findings confirm that there is a variability in the biological potency among different extracts. In addition, the standardization of grass extracts based on Phlp 5 only, may be insufficient in some cases.
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