ADITEC FLU 2 STUDY: Understanding the Genetics Basis for Immune Responses to Flu Vaccines in Children and Adults

Inclusion Criteria: * Children: * The investigator believes that the parents/LAR(s) of the child can and will comply with requirements of the protocol (e.g. completion of electronic diary, understanding of study procedure, consent process, availability at visits) and have internet access for the duration of the study. * Written informed consent obtained from parent/LAR(s) of the subject * Age from 13 months up to 24 months (excluding 24 months + 0 days and older) at time of V1 (first immunisation visit) * Born to two caucasian parents * Participant is healthy as determined by medical history and clinical examination * Have received all the vaccines specified in the UK immunisation schedule Adults: * Written and informed consent obtained from participant * Age from 18 years up to 65 years (excluding 65 yrs + 0 days and older) * Caucasian * Participant has internet access for the duration of the study * Participant is healthy as determined by medical history and clinical examination Exclusion Criteria: * Children * Child in care * Use (or planned use) of any non-registered or investigational product in last 30 days * Previous influenza vaccination * Microbiologically proven influenza illness or treatment with antiviral medications * Confirmed or suspected egg allergy * Chronic serious medical conditions which may, in the opinion of the investigator, interfere with evaluation of study objectives e.g. chronic lung disease, chronic liver/renal diseas…