Evaluation of Pandemic Influenza A (H1N1)Candidate Vaccines

Inclusion Criteria: * Health adults of both genders * Age ≥ 18 ≤ 50 years * Able to understand every required study procedure * Female volunteers should agree to take an acceptable contraceptive method Menopause is characterized by absence of menstrual flux for two consective years * Normal values for pre-stablished laboratory assays * Accpetance to participate and sign the consent form Exclusion Criteria: * Any chronic condition * Be on immunossupressive or stimulant therapy * Have egg alergy * Have past history of alergy to sazonal influenza vaccine * Have received another inactivated vaccine within the prior 2 weeks or a live vaccine in the past four weeks to his/her participation in the study * Acute infectious disease during seven days prior vaccination * Female on breasthfeeding * Confirmed prior infection by pandemic influenza A * Participation in another clinical trial in the last 6 months * Any other condition identified by the principal investigator which is considered not safe for enrollment of the volunteer