The State of the World’s Children 2023

The State of the World’s Children 2023 was developed in collaboration with VCP and using Vaccine Confidence Index data. It reveals that public perception of the importance of vaccines for children declined during the COVID-19 pandemic in 52 out of 55 countries studied.


Vaccine confidence in Japan is low compared to other countries. The latest data we have for Japan is from surveys conducted in 2022 which showed that 61% of people feel that vaccines are safe and 74% think they are effective. 54% of those surveyed said they believe it’s important for children to have vaccines and 36% feel that vaccines are compatible with their religious beliefs.

Corowa-kun: A messenger app chatbot delivers COVID-19 vaccine information in Japan

Japan has one of the highest vaccine hesitancy rates in the world. However, few studies have assessed how mobile messenger apps affect COVID-19 vaccine hesitancy. This study used a cross-sectional survey to assess the impact of text messages from Corowa-kun – a free chatbot – on COVID-19 vaccine hesitancy amongst users.