Factors affecting guardians' decision-making regarding the SARS-CoV-2 vaccine.

Guardians who had had one of their children vaccinated at least once emphasized the importance of prevalence and free vaccination. On the other hand, guardians who had not had any of their children vaccinated placed particular importance on adverse reactions and the Japanese data on effectiveness. To guide the decision-making of guardians, it is necessary to quickly collect and publish data on adverse reactions and effectiveness, particularly in Japanese individuals, so that citizens can decide whether to vaccinate themselves and their children.