The baseline period prior to treatment with Lactobacillus paracasei LP-33 is 7 days. On recommendations of the consulted experts, Pr Bousquet and Pr Hamelmann, a wash-out period of 3 additional days is recommended before baseline for subject using intranasal corticosteroid before their inclusion. As a consequence, the baseline may be extended to 10 days for these subjects In case the subject consumed an anti-H1 (other than Loratadine) before his (her) inclusion, he (she) will have to switch to Loratadine to be included.