Study to Investigate the Efficacy and Safety of Apomivir®

This is a prospective, randomized, double-blind, parallel, placebo-controlled, multi-center study. Approximately 196 subjects with fever defined as body temperature >= 38˚C, with at least one respiratory symptom and one other constitutional symptom will be invited into this study to target 156 evaluable subjects. A nasopharyngeal/throat swabs rapid test for influenza A and B will be conducted and only subjects with positive results could be recruited. All eligible subjects will be randomized to one of the following treatment group in a 1:1 ratio.

Study Group: Apomivir® 1 capsule (120 mg/cap) twice daily for 5 days Control Group: Placebo 1 capsule twice daily for 5 days A pack of acetaminophen (500 mg) will be provided at enrollment. All flu symptom relief agents could be used only for rescue use of persistent fever or flu symptoms (>= 24 hours). A digital thermometer and diary card will be dispensed at baseline (Day 1). Subjects will be instructed to complete the body temperature record, and daily record regarding the severity of their influenza symptoms and the level of interference on daily activity. The monitoring frequency will be twice daily (after drug administration) from Day 1 to Day 5, and cut down to once daily until Day 29 or completed cure (defined as remission of all flu symptoms and interferences). Treatment failure is defined as secondary illnesses, antibiotic use and hospitalization due to disease progression.

For safety and efficacy assessments, all subjects should return on Day 3, 6 and 15. For subjects who are not completely cured before Day 15 (Visit 4), further therapy will be conducted and they should return on Day 29; for those who are completely cured, only a telephone follow-up will be conducted on Day 29.

The severity of fever will be scored using a 4-point scale:

0 = < 37.2°C

• = >= 37.2 to < 38.0°C
• = >= 38.0 to < 39.0°C
• = >= 39.0 °C

Other influenza symptoms (such as cough, nasal obstruction, sore throat, fatigue, headache and myalgias) will also be assessed using a 4-point scale:

0 = none,

• = mild,
• = moderate,
• = severe

The level of interference on daily activities (including running, lifting heavy objects, participating in strenuous sports, moderate activities), such as moving a table, pushing a vacuum cleaner, bowling, or playing golf, lifting or carrying groceries, climbing several flights of stairs, climbing one flight of stairs, bending, kneeling, or stooping, walking more than a mile, walking several blocks, walking one blocks, and bathing or dressing yourself, will be assessed according to a 3-point scale

0 = no, no limited

• = yes, limited a little
• = yes, limited a lot

Confirmatory tests for infective virus strain, real-time RT-PCR and viral culture will be conducted at baseline. In the following study visits, real-time RT-PCR will be performed to measure the influenza viral load/titer in nasopharyngeal/throat swabs specimen. For those who have been completely cured prior to Day 15, the real-time RT-PCR assessment could be omitted on Day 29. All subjects enrolled will be followed until the end of study, but only subjects with influenza PCR or viral culture positive could be evaluable population.

• Main inclusion criteria:

• Females and males aged between 20 and 65
• Presumptive diagnosis of influenza based on the following clinical characteristics:

• Present at least one respiratory symptom (e.g. cough, nasal obstruction, sore throat) and at least one constitutional symptom other than fever (e.g. fatigue, headache, myalgias) of less than 48-hour duration
• Positive for influenza A or B (nasopharyngeal/throat swab - rapid test)
• Able and willing to comply with the study procedure and give written informed consent

• Main exclusion criteria:

• Female who is pregnant/lactating or planning to be pregnant, or female of childbearing potential* who is not using medically recognized method of contraception

• Other than those who have been surgically sterilized (defined as having undergone hysterectomy or bilateral oophorectomy or bilateral salpingectomy; tubal ligation alone is not considered sufficient) or one year post-menopausal
• Subject with chronic pulmonary diseases or critical condition or already developed severe respiratory distress with hypoxaemia on presentation
• Subject with a history of non-febrile convulsions, neuromuscular disorders or cognitive dysfunction that may compromise respiratory secretions, or who are currently receiving anticonvulsive agents
• Subject with clinically important illness, malignancies, systemic infection, other medical or psychiatric condition which places the subject at unacceptable risk to participate in the study or confounds the ability to interpret data from the study
• Subject with significant abnormal laboratory findings (hemoglobin level < 9.0 g/dL, WBC < 4000/mm3, platelet count < 100,000/mm3, ALT or AST > 2.5 x upper limit of normal (ULN), or estimated creatinine clearance < 30 mL/min within 4 weeks prior to baseline)
• Subject who are currently receiving immunosuppressive therapy,
• Subject has taken daily supplement(s) containing blue agar within 1 month prior to screening, or any other medication that may affect the study results
• Known hypersensitivity to any ingredients in Apomivir® or other blue agar
• Use of any investigational product within 1 month prior to screening