Clinical Research Directory

Inclusion Criteria: 1. Willing and able to provide written informed consent 2. Aged ≥60 years at the time of study enrolment 3. No influenza vaccination in the previous 8 months 4. Able to attend all visits and comply with study procedures 5. Owns a mobile phone Exclusion Criteria: 1. History of a severe allergic reaction (e.g. anaphylaxis) to any component of the vaccine, including egg protein, or after any previous dose of any influenza vaccine, including a History of Guillain-Barré syndrome (GBS) within 6 weeks following previous influenza vaccination a. Note: mild allergic reactions (like hives) after eating eggs are not a contraindication to influenza vaccination or study enrolment 2. Moderate or severe acute illness/infection (according to investigator judgement) on the day of vaccination, or febrile illness (temperature ≥ 37.5°C). A prospective participant should not be included in the study until the condition has resolved or the febrile event has subsided. 3. Self-reported thrombocytopenia, contraindicating IM vaccination 4. Known or suspected congenital or acquired immunodeficiency; or receipt of immunosuppressive therapy, such as anti-cancer chemotherapy or radiation therapy, within the preceding six months; or long-term systemic corticosteroid therapy (prednisolone ≥ 7.5mg/day or equivalent for more than 2 consecutive weeks within the past 3 months) 5. Chronic illness that, in the opinion of the investigator, is at a stage where it might interfere with trial conduct or completion 6. Deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalized involuntarily 7. Current alcohol abuse or drug addiction that might interfere with the ability to comply with trial procedures in the opinion of the Investigator