Having Iranian citizenship or in the case of foreign nationals with a legal residence permit Age 18 years and older History of full vaccination with one of the following vaccines: Sinopharm, Razi Cov Pars, Pastocovac, Spikogen, AstraZeneca, Fakhra, or Barkat at least 5 months before the study Minimum 5 and maximum 9 months interval between the last vaccine dose and the current study participation In the last six months, the person has not had a confirmed Covid-19 disease based on laboratory evidence or confirmed by a physician Signing a written informed consent form Using at least one reliable contraceptive method (condom, oral contraceptive pills, intrauterine contraceptive device, IUD, Norplant capsule) for women of reproductive age 18 to 49 years until 3 months after receiving the booster dose Negative pregnancy test (baby check) on the day of vaccination

Having Iranian citizenship or in the case of foreign nationals with a legal residence permit Age 18 years and older History of full vaccination with one of the following vaccines: Sinopharm, Razi Cov Pars, Pastocovac, Spikogen, AstraZeneca, Fakhra, or Barkat at least 5 months before the study Minimum 5 and maximum 9 months interval between the last vaccine dose and the current study participation In the last six months, the person has not had a confirmed Covid-19 disease based on laboratory evidence or confirmed by a physician Signing a written informed consent form Using at least one reliable contraceptive method (condom, oral contraceptive pills, intrauterine contraceptive device, IUD, Norplant capsule) for women of reproductive age 18 to 49 years until 3 months after receiving the booster dose Negative pregnancy test (baby check) on the day of vaccination