Safety and Efficacy of ADC189 in Children 2-11 Years Old With Influenza

Key Inclusion Criteria: * 1\. Patients aged 2 to 11 years at screening, both sex; * 2\. Patients were diagnosed with Influenza A Vairus Infection/Influenza B Virus Infection. * 3\. Parents willing and able to comply with study requirements, under the judgment of investigators . * 4\. Onset of symptoms no more than 48 hours before presentation for screening. Key Exclusion Criteria: * 1\. Patients with severe influenza. * 2\. Pregnant or breast-feeding females * 3\. Patients with acute respiratory infection, tympanitis, sinusitis, or acute asthma attack within 2 weeks before screening. * 4\. Presence of a chronic disease or illness that may indicate increased risk for influenza-related complications. * 5\. Other antiviral therapy is required during screening.