This chapter contains sections titled: Introduction Recombinant allergens for SIT Hypoallergenic recombinant allergens Allergen hybrids T‐cell peptide epitopes CpG oligonucleotides in SIT Conclusions References Introduction Recombinant allergens for SIT Hypoallergenic recombinant allergens Allergen hybrids T‐cell peptide epitopes CpG oligonucleotides in SIT Conclusions References