The Safety and Immunogenicity Evaluation of Live Attenuated Influenza Vaccine

Inclusion Criteria: * Healthy volunteers aged in 3-59 years old. * Had not received vaccination of Influenza vaccine in the past half of years. * Had not infected with Influenza virus. * This trail has been agreed by volunteers or his/her legal guardian. * Volunteers or his/her legal guardian will fellow this trail protocol. Exclusion Criteria: * People from 18-59 age group with abnormal laboratory index. (slight abnormality is except if judged with no clinical significance by doctors.) * People with fever before vaccination, temperature higher than 37.0 ℃ * Females in suckling period, pregnancy (pregnancy test positive) or prepared to be pregnant * People given whole blood, plasma or immunoglobulin therapy within 3 months before vaccination * According to judgement of researchers, the subjects have any other factors that are not appropriate for this clinical trials. * Acute infectious disease or acute attack of chronic disease before inoculation * People get any vaccine within 14 days before the trial. * People in immune deficiency or diagnosed with congenital or acquired immunodeficiency, people with immunosuppressive therapy in the past six months. * People with epilepsy or a history of mental illness