Safety and Immunogenicity of Haemophilus Influenzae Type b Conjugate Vaccine，Freeze-dried

Inclusion Criteria: * Healthy permanent residence 2 months to 5 years old. * Subjects who the investigator believes will comply with the requirements of the protocol should be enrolled in the study. * Subjects and parent/guardian able to attend all scheduled visits and comply with all study procedures. * Axillary temperature ≤37.0 ℃. Exclusion Criteria: * History of Haemophilus influenzae type b infection or vaccination of Haemophilus influenzae type b conjugate vaccine. * Allergic history or any SAE after vaccination, such as allergy, urticaria, dyspnea, angioedema, celialgia. * Receipt of blood or blood-derived products in the 3 months preceding vaccination * Participation in another clinical study investigating a vaccine, drug in the 30 days preceding vaccination. * Receipt of any live virus vaccine in the 15 days preceding vaccination. * Receipt of any subunit vaccine and inactivated vaccine in the 7 days before vaccination. * Febrile illness (temperature ≥ 38°C) in the 3 days or any acute illness/infection in the 7 days preceding vaccination. * Thrombocytopenia. * History of treatment for thyroid gland disease. * Functional or anatomic asplenia. * History of eclampsia, epilepsy, encephalopathy and mental disease or family disease. * Any condition that, in the judgment of investigator, may affect trial assessment.