Vaccines, Immunology and Clinical Trials

Influenza and Respiratory Vaccines

Influenza is an acute respiratory illness that affects the upper and/or lower respiratory tract and is caused by the influenza virus, usually of type A or B. Influenza circulates continuously, causing seasonal epidemics in temperate regions and year-round epidemics in some tropical regions. Influenza viruses are continuously changing, necessitating an annual change in vaccine strains to better match with currently circulating influenza strains globally.