inclusion criteria: - written informed consent and any locally required authorisation obtained from the participant prior to performing any protocol-related procedures, including screening evaluations. - negative sars-cov-2 qrt-pcr and/or serology tests prior to randomisation. - weight ≥ 50 kg and ≤ 110 kg at screening, including a bmi of ≥ 18.0 to ≤ 30.0 kg/m^2. - healthy by medical history, physical examination, and baseline safety laboratory studies, according to the judgement of the pi. - electrocardiogram without clinically significant abnormalities at screening. - able to complete the follow-up period through day 361. - females of childbearing potential who are sexually active with a non-sterilised male partner must have used a highly effective method of contraception for at least 28 days prior to dosing with imp and must agree to continue using such precautions until the final follow-up visit. periodic abstinence, the rhythm method, and the withdrawal method are not acceptable methods of contraception.

inclusion criteria: - written informed consent and any locally required authorisation obtained from the participant prior to performing any protocol-related procedures, including screening evaluations. - negative sars-cov-2 qrt-pcr and/or serology tests prior to randomisation. - weight ≥ 50 kg and ≤ 110 kg at screening, including a bmi of ≥ 18.0 to ≤ 30.0 kg/m^2. - healthy by medical history, physical examination, and baseline safety laboratory studies, according to the judgement of the pi. - electrocardiogram without clinically significant abnormalities at screening. - able to complete the follow-up period through day 361. - females of childbearing potential who are sexually active with a non-sterilised male partner must have used a highly effective method of contraception for at least 28 days prior to dosing with imp and must agree to continue using such precautions until the final follow-up visit. periodic abstinence, the rhythm method, and the withdrawal method are not acceptable methods of contraception.