According to the Centers for Disease Control and Prevention (CDC), vaccines remain the best defense against many serious infectious diseases and pandemic threats. Never has this been more highlighted than by the global coronavirus pandemic, where there is an intense focus on developing a vaccine, which, subsequently, will need to be distributed to enable widespread inoculation of large populations. The flu vaccine – approximately 170 million doses of which were distributed during the 2019/2020 flu season, based on CDC estimates – prevents millions of cases of influenza and thousands of resulting deaths each year.