Eligibility Criteria:
Inclusion Criteria:
* physically and mentally healthy as judged by means of a medical and laboratory standard
* the outcome of the following examinations should be clinically insignificant: medical and surgical history (hypo-, hypertension, allergy, other diseases, major surgery, micturition, defecation, sleep, illness within the last 4 weeks prior to the start of the trial)
* life style and habits (consumption of alcohol, nicotine, coffee, tea, coke, special diet, drug abuse) should be normal/acceptable
* body temperature, pulse rate, blood pressure, 12 lead ECG should be normal/acceptable.
* physical examination (general state and abnormal findings per system: endocrine/metabolic, allergies, drug sensitivities, head, neck, eyes, ears, nose, throat, cardiovascular, respiratory, gastrointestinal, hepatic/biliary, urogenital, musculoskeletal, Iymph nodes, skin, and neurological/psychiatric) should be normal/acceptable
* laboratory examination (blood/serum examination: sodium, potassium, calcium, chloride, total protein, glucose, creatinine, BUN, uric acid, total bilirubin, AST, ALT, GGT, ALP, haemoglobin, haematocrit, erythrocytes, Ieukocytes, platelet count; HBsAg, HIV-Ab, HCV-Ab; urine examination: urine pH, protein, glucose, ketones, blood, Ieukocytes, bilirubin, nitrites and sediment) should be normal/acceptable.
* normal body weight in relation to height and age according to weight(kg) BMI = (accepted range 18.5 and30 kg/m2) height (m)2
* subjects must be competent to sign and have signed a consent form before study entry
Exclusion Criteria:
* acute or chronic upper airways disease, chronic cough, chronic rhinitis (e.g. allergic rhinitis) or asthma,
* vaccination against influenza or swine flu
* within 21 days before the study start, suspected swine flu or influenza, body temperature 38 0C,
* pregnancy or nursing,
* use of immunosuppressant, stimulants or common cold therapeutics,
* bacterial tonsillitis,
* allergic diathesis or any clinically significant allergic disease (i.e. asthma)
* any history of drug hypersensitivity (especially to β-glucan and related compounds)
* presence or a history of clinically significant cardiovascular, renal, hepatic, pulmonary, metabolic, endocrine, haematological, gastrointestinal, neurological, psychiatric or other major diseases
* clinically significant illness within 4 weeks before the start of the study
* intake or administration of any prescribed systemic or topical medication within 2 weeks prior to the start of the study; in the case of intake or administration of any prescribed systemic or topical medication within 4 weeks before the start of the study because of an insignificant illness, this should be stated in the CRF.
* intake or administration of OTC medication (including herbal remedies) within 1 week prior to the start of the study
* concomitant intake or administration of any systemic or topical drugs (including herbal remedies)
* treatment with any investigational drug (i.e., drug not yet approved) in the last 2 months (60 days) before beginning of the trial
* medication with drugs known to alter organs or systems such as barbiturates, phenothiazines, cimetidine, omeprazole etc. within the last 2 months (60 days)
* major surgery of the gastrointestinal tract except for appendectomy
* supine blood pressure, after resting for 5 min, higher than 140/90 or lower than 100/60 mmHg
* supine pulse rate, after resting for 5 min, outside the range of 50 - 90 beats/min
* any clinically significant abnormality of the ECG (12 leads) recorded in rest
* laboratory values outside the normal range (Appendix 5) with clinical relevance at entry examination
* alcohol abuse i.e. regular use of more than 2 units of alcohol per day or a history of alcoholism or drug/chemical abuse (one unit of alcohol equals ½ l of beer, 200 ml wine or 50 ml of spirits) or recovered alcoholics
* vegetarian or any special diet due to any reason
* knowledge to have any type of parenterally transmitted hepatitis or carrier of the HBsAg (HBsAg test positive)
* HIV-Ab test positive
* Test on anti-HCV antibodies positive
* legal incapacity and/or other circumstances rendering the subject unable to understand the nature, scope and possible consequences of the study
* evidence of an uncooperative attitude
* \> 10 % non-compliance to the investigational product.