Clinical Research Directory

Inclusion Criteria: * ≥18 years old; * Have participated in the healthcare personnel cohort study at Hospital Nacional Cayetano Heredia or Hospital Nacional Arzobispo Loayza during 2016-2021; * Work at the facility full-time (≥30 hours per week); * Have routine, direct, hands-on or face-to-face contact with patients (≤1 meter) as part of a typical work shift, including, but not limited to, physicians, nurses, respiratory therapists, physical therapists, unit clerks, radiograph technicians, medical assistants, and transporters; * Work at the facility for ≥1 year prior to enrollment and planning to continue working at the facility for one year after enrollment; * Willing to receive influenza vaccination (adjuvanted or standard dose); * Women of childbearing age must complete the following criteria to be eligible: 1. Have a negative urine pregnancy test performed by the study staff ≤24 hours preceding receipt of the vaccine; 2. Be willing to use a reliable form of contraception approved by the Investigator for ≤2 months after receiving the vaccine. If they are not currently using an approved contraceptive, study staff will provide access to contraceptives; 3. Must not be breastfeeding. Exclusion Criteria: * Have received a vaccine against influenza during the 2022 influenza season (season of clinical trial); * Have a severe, life-threatening allergy to influenza vaccines, eggs, or influenza vaccine components; * Have a history of Guillain-Barre Syndrome or other autoimmune diseases; * Received blood or blood products within 3 months of enrollment; * Be pregnant, confirmed by rapid pregnancy test.