Abstract
Recently, importance of vaccines for treatment and prevention of emerging and re-emerging infectious diseases has been re-recognized. A replication-incompetent adenovirus（Ad） vector vaccine expressing virus antigen proteins is one of the most advanced platforms as a novel vaccine because an Ad vector vaccine can be rapidly applicable to pandemic. In this review, we describe the basic properties of an Ad vector for vaccine, in addition to the summary of the development of an Ad vector vaccine for emerging and re-emerging infectious diseases, including Coronavirus disease 2019（COVID-19）, worldwide.
