A Study to Evaluate the Efficacy and Safety of ZX-7101A Tablets in Adults with Uncomplicated Influenza

Inclusion Criteria: * ≥18 to ≤64 years of age at the time of signing the ICF. * Patients in the screening period met the following criteria: (1) rapid influenza diagnostic test (RIDT) or polymerase chain reaction (PCR) test positive; (2) fever ≥ 37.3℃ (axillary temperature) at screening; if taking antipyretics, axillary temperature ≥ 37.3℃ after taking the drug (more than 4 hours). (3) At least one of flu-related systemic symptoms is moderate or greater in severity: a. muscle or joint pain, b. fatigue, c. headache, d. fever. (4) At least one of the influenza-related respiratory symptoms is moderate or greater in severity: a. nasal congestion, b. sore throat, c. cough. * The first occurrence of influenza symptoms ≤ 48 hours from the time of patient randomization. Exclusion Criteria: * Patients with influenza virus infection requiring hospitalization. * High-risk population. * Bronchitis, pneumonia, pleural effusion or interstitial disease suspected by a clinician or confirmed by chest imaging \[X-ray (anteroposterior or anteroposterior)/CT\] and judged clinically significant by the investigator at screening. * Patients who have developed acute respiratory tract infection, otitis media, and sinusitis within 2 weeks before screening. * Patients with other infections requiring systemic anti-infective treatment, or blood routine examination at screening: white blood cell count (WBC) \> 10.0 × 109/L. * Patients with purulent sputum or suppurative tonsillitis. * Those who have difficulty in swallowing drugs or have a history of gastrointestinal diseases that seriously affect drug absorption. * Medications against influenza virus within 7 days prior to Screening.