The Concinol vaccine does not currently have a third dose, but can be given as a third booster. The Concinol vaccine is an adenovirus-vectored vaccine, which is currently being used on a large scale in China. At present, only one injection is needed to achieve a considerable protective effect, and there is no matching third injection, so there is no such thing as a third injection. However, it can be inoculated as the third booster shot for sequential inoculation. If the first two injections are inactivated vaccines such as Beijing Coxing and Beijing Biological Vaccine, then the third booster injection can be chosen to vaccinate with Connoisseur’s Vaccine, and a more comprehensive protection can be achieved through sequential inoculation, especially against the mutated strains such as Omicron, which has a better protective effect.