Comparison of alum-precipitated aqueous extracts and modified ragweed tyrosine adsorbate vaccine in the treatment of ragweed hay fever.

Thirty-five ragweed-sensitive patients received immunotherapy with either alum-precipitated aqueous extracts (AP) or modified ragweed tyrosine adsorbate vaccine (Pollinex-R). Symptoms decreased with AP therapy only. Immunologically, there was a blunted specific IgE response and little specific IgG increase associated with both groups. Alum-precipitated aqueous extracts appeared to be more efficacious than Pollinex-R.