Lianhua Qingwen capsule for the treatment of H1N1 Flu: a double blinding and muti-central randomized placebo-controlled trial

INTERVENTION: Group A:Lianhua Qingwen capsule 2.4g three times a day orally;Group B:Placebo 2.4g three times a day orally; CONDITION: H1N1 flu J00.X02 PRIMARY OUTCOME: Time to relief of flu‐like symptom; SECONDARY OUTCOME: Hospital stay;Symptom score of Traditional Chinese Medicine;Time to relief of single flu symptom;Time of Fever Clearance;Viral nucleic acid overcas; INCLUSION CRITERIA: 1. Patients with H1N1 flu confirmed by virology (According to the 3rd version of Diagnosis and Treatment Protocol of H1N1 flue, released by Health ministry of People's republic of China, 2009); 2. Patients aged 16 to 65 years old of both gender; 3. Axillary temperature >=37.4 degree C and with at least symptoms including cough, sore throat, headache, myalgia, fatigue, nasal obstruction, running nose, et al.; 4. Disease course was within 36 hours and no other drug for flu was used; 5. Voluntarily signed the informed consent.