Tolerability and Immunogenicity of Fluval P Monovalent Influenza Vaccine

Inclusion Criteria: * Adults aged 18 to 60 years, elderly people aged over 60 years, from both sexes, with full contractual capacity; * Are in good health (as determined by vital signs and existing medical condition) or are in stable medical condition. Subjects will not be excluded with known adequately treated clinically significant organ or systemic diseases (e.g. asthma or diabetes), such that, in the opinion of the investigator, the significance of the disease will not compromise the subject's participation in the study; * Femal volunteers of childbearing potential with a negative result from the urine pregnancy test prior to vaccination who agrees to use an acceptable contraception method or abstinence throughout the trial and not become pregnant for the duration of the study. * Capable of understanding and complying with study protocol requirements; * The volunteers provide written informed consent prior to initiation of study procedures; * Absence of existence of any exclusion criteria. Exclusion Criteria: * Pregnancy or breast feeding or positive urine pregnancy test at baseline prior to vaccination; * Known allergy to eggs or other components of the vaccine (in particular mercury); * History of Guillain-Barré syndrome; * Active neoplasm; * Immunosuppressive therapy in the preceding 36 months; * Concomitant corticosteroid therapy, including high-dose inhaled corticosteroids; * Immunoglobulin (or similar blood product) therapy within 3 months prior to vaccination; * Documented HIV, HBV or HCV infection; * Chronic illness that, in the opinion of the investigator, may interfere with the evaluation of the immunoresponse; * Acute febrile respiratory illness within one week prior to vaccination; * Vaccine therapy within 4 weeks prior to vaccination; * Influenza vaccination within 6 months prior to vaccination; * Experimental drug therapy within 1 month prior to vaccination; * Past or current psychiatric disease of the volunteer that upon judgement of the investigator may have effect on the objective decision-making of the volunteer; * Alcohol or drug abuse of the participant.