Meningitis, Epiglottitis, Pneumonia, Arthritis Caused by Haemophilus Influenzae Type b Clinical Trial
Official title:
A Phase IIIb, Controlled, Open Label, Single-Center, Persistency, Extension Study in Chinese Children After a 2+1 Dose Series of Either CRM197-Conjugate Haemophilus Influenzae Type b Vaccine or Tetanus Toxoid-Conjugate Haemophilus Influenzae Type b Vaccine
Evaluate the persistency of immune response against Haemophilus influenzae type b by assessing anti-PRP antibody levels in children vaccinated with either Hib-CRM197 or Hib-TT booster vaccine approximately 4 years before.
n/a
Allocation: Non-Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Prevention