Safety, Tolerability, PK and PD of SSS55 in Healthy Subjects

Inclusion criteria

• ✓. Healthy subjects aged 18 to 45 years old (including the boundary value), regardless of gender;
• ✓. The subjects voluntarily participated in the clinical trial and signed the informed consent form;
• ✓. Men with a weight of ≥50 kg, women with a weight of ≥45 kg, and those with a body mass index (BMI) ranging from 19 to 28 kg/m2 (including the critical value);
• ✓. Those who underwent vital sign assessment, physical examination, blood routine, urine routine, blood biochemistry, coagulation function, pregnancy examination (for women of childbearing age), 12-lead ECG, chest X-ray/lung CT during screening, and the results showed no abnormalities or the abnormalities had no clinical significance;
• ✓. Be willing to receive the MV-ACYW meningococcal vaccine and pneumococcal vaccine 14 days or more before randomization.