inclusion criteria: * able to provide written informed consent * males or females. aged ≥ 18 years old * body mass index (bmi) between 18.0 and 26.0 kg/m2 * normal or abnormal but non-clinical significant physical examination, vital signs, 12-ecg and chest ct, etc * no plan of pregnancy and being willing to use effective contraceptive measures (including partner) from informed consent to 6 months after administration of scta01/placebo (abstinence，sterilization operation，contraceptive barrier，acyeterion , etc.)

inclusion criteria: * able to provide written informed consent * males or females. aged ≥ 18 years old * body mass index (bmi) between 18.0 and 26.0 kg/m2 * normal or abnormal but non-clinical significant physical examination, vital signs, 12-ecg and chest ct, etc * no plan of pregnancy and being willing to use effective contraceptive measures (including partner) from informed consent to 6 months after administration of scta01/placebo (abstinence，sterilization operation，contraceptive barrier，acyeterion , etc.)

inclusion criteria: - able to provide written informed consent - males or females. aged ≥ 18 years old - body mass index (bmi) between 18.0 and 26.0 kg/m2 - normal or abnormal but non-clinical significant physical examination, vital signs, 12-ecg and chest ct, etc - no plan of pregnancy and being willing to use effective contraceptive measures (including partner) from informed consent to 6 months after administration of scta01/placebo (abstinence，sterilization operation，contraceptive barrier，acyeterion , etc.)

inclusion criteria: - able to provide written informed consent - males or females. aged ≥ 18 years old - body mass index (bmi) between 18.0 and 26.0 kg/m2 - normal or abnormal but non-clinical significant physical examination, vital signs, 12-ecg and chest ct, etc - no plan of pregnancy and being willing to use effective contraceptive measures (including partner) from informed consent to 6 months after administration of scta01/placebo (abstinence，sterilization operation，contraceptive barrier，acyeterion , etc.)