Inclusion Criteria:
1. Having written informed consent to participate in the study obtained from the patient prior to the start of any procedures related to the study.
2. Men and women aged 18-55 years at the time of signing the informed consent.
3. Documented allergic rhinitis (AR) with a history of sensitization to birch pollen for at least 2 years prior to signing an informed consent.
4. Body mass index (BMI) 18.5≤BMI≤29.9 kg / m2.
5. Positive skin test (pric test) for the birch pollen allergen papule (blister) ≥ 3 mm at Screening.
6. A positive result for the presence of specific IgE to birch pollen in blood serum (sensitization level of class 2 and higher, which corresponds to quantitative indicators ≥ 0.7 kU/l) at Screening.
7. Consent to use a reliable method of contraception in accordance with the clinical trial protocol for the entire duration of participation in the study.
Exclusion Criteria:
1. Structural abnormalities of the nose or nasal polyposis, a history of frequent nosebleeds (more than once a month), nasal surgery (performed less than 12 months prior to signing the informed consent form), or ongoing upper respiratory tract infection.
2. Any respiratory disease, or any other acute infectious disease that has resolved less than 4 weeks prior to signing the informed consent form.
3. Any allergenspecific therapy (AIT) less than 3 years before signing the informed consent form.
4. Anaphylactic shock during AIT in the anamnesis.
5. Any immunopathological conditions and immunodeficiency.
6. Uncontrolled bronchial asthma that requires medical treatment.
7. Presence of clinically significant sensitization to year-round allergens (epidermal allergens, house dust allergens, etc.) at the time of screening.
8. Severe chronic or recurrent diseases that, according to the researcher, may interfere with AIT.
9. Convulsive seizures or a history of epilepsy.
10. Any chronic or recurrent infectious diseases in the anamnesis in the acute stage.
11. The presence of significant deviations according to physical examination, vital signs measurement, as well as laboratory tests, electrocardiography and fluorography / radiography of the lungs performed on analog (film) or digital fluorographs/X-ray machines, which in the opinion of the researcher may interfere with ASIT.
12. Malignancy of any nature and localization in the anamnesis.
13. A history of bone marrow transplantation (BMT) or peripheral blood hematopoietic stem cells (TSCC).
14. The presence of clinically significant cardiovascular and mental illnesses that, according to the researcher, may hinder the implementation of ASIT.
15. Dehydration due to diarrhea, vomiting, or other causes within 24 hours prior to subcutaneous injection of the test drug or placebo.
16. Blood donation or blood loss (450 ml of blood or more) less than 3 months before signing the informed consent.
17. Participation in clinical trials of any medications (less than 3 months or 5 half-lives from taking the study drug, whichever is longer) before subcutaneous administration of the study drug or placebo.
18. Regular alcohol consumption exceeding 5 units of alcohol per week or information about alcoholism, drug addiction, or drug abuse in the anamnesis.
19. Seropositive HIV status (presence of anti-HIV-1 and/or anti-HIV-2 in the blood) and/or detection of markers of acute hepatitis B (presence of HBsAg in the blood) and/or hepatitis C (presence of anti-HCV in the blood) and/or syphilis.
20. Surgery on ENT organs and/or any other surgical interventions planned for the period of participation in the study, except for those that can be performed on an outpatient basis and under local anesthesia (for example, tooth extraction, nevus removal, etc.).
21. The use of the following medications (the use of hormonal contraceptives is allowed):
i. parenteral administration of steroid drugs within 12 weeks prior to signing of informed consent; ii. oral steroid medications within 8 weeks prior to signing informed consent; iii. inhaled and topical steroid medications within 4 weeks prior to signing the informed consent form; iv. beta-blockers, including topical forms, within 1 week prior to signing informed consent; v. MAO inhibitors in combination with sympathomimetics for 1 week prior to signing of informed consent; vi. vaccination with any vaccine within 4 weeks before signing the informed consent; vii. immunotherapy, including treatment with immunosuppressive or genetically engineered biological drugs (GBPS), within 24 weeks prior to signing the informed consent.
22. Pregnancy or breast-feeding.
23. Hypersensitivity to any of the components of the drug/placebo, with the exception of hypersensitivity to a causally significant allergen (birch pollen).
24. Psychological, family, sociological, or geographical conditions that potentially hinder compliance with the study protocol and follow-up schedule.
25. Unwillingness or inability to comply with the requirements of this protocol.
