Background: IgE-mediated sensitization to the Chenopodiaceae/Amaranthaceae families is a cause of allergic symptoms in arid areas. Salsola kali and Chenopodium album are considered the main species responsible; however, there is a discrepancy between the pollination period of these two plants and clinical symptoms. The objectives of this study were to identify new Chenopodiaceae/Amaranthaceae members with sensitization capacity and to correlate symptoms, pollen counts and degree of flowering of different species. Methods: A total of 37 individuals monosensitized to S. kali and C. album were included in the study. All patients recorded daily symptom scores between May and October 2007. Extracts from Chenopodium (album, vulvaria and murale), Salsola (kali, vermiculata, and oppositifolia), Bassia scoparia, Atriplex (patula and halimus) and Amaranthus (deflexus and muricatus) were manufactured and used in skin prick tests (SPTs). Protein content and IgE binding were assessed for each extract. Pollen counts and degree of flowering (based on the Orshan specific semiquantitative method) were assessed weekly. Results: Symptom scores demonstrated a positive correlation with pollen counts even outside the pollination period of S. kali. Positive SPTs were obtained with all 11 species tested, which showed common proteins with IgE-binding capacity. Different species flowered at different times during the pollen season. Conclusion: Different taxonomically related species of Chenopodiaceae/Amaranthaceae can induce allergic sensitization and should be considered for use in diagnosis and treatment. Degree of flowering is a complementary method for assessing pollination that could be used for botanical families with indistinguishable pollen grains.

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