Determinants of vaccine hesitancy among pregnant women in South-West Nigeria: an explanatory sequential mixed method design.

Objective: This study aimed to assess the prevalence and determinants of vaccine hesitancy among pregnant women in South-West Nigeria.

Design: An explanatory sequential mixed-methods study was conducted between January and March 2023. Participants for the quantitative phase were selected using a systematic sampling technique, while those for the qualitative phase were purposively selected. A modified parent attitude about childhood vaccines questionnaire was used for data collection and analysed using IBM SPSS V.25.0. Qualitative data were collected through focus group discussions and analysed using NVivo V.14. Univariable, bivariable and multivariable logistic regression analysis was done. A p<0.05 was considered statistically significant.

Setting: A tertiary health facility in South-West Nigeria.

Participants: Three hundred and forty-five pregnant women participated in the quantitative phase, while 24 pregnant women were involved in the qualitative phase.

Results: The overall prevalence of vaccine hesitancy was 32%. Based on the domains, only 15.4% of the respondents were hesitant due to vaccination behaviour, 38.6% for safety and efficacy, and 49.6% were hesitant due to general attitude and trust for healthcare providers. Maternal age, number of children, religion and occupation showed significant association with vaccine hesitancy. Regarding the predictors of vaccine hesitancy, employed pregnant women (adjusted OR (aOR), 4.33; 95% CI: 1.60 to 9.70) and younger pregnant women (aOR, 2.53; 95% CI: 1.04 to 7.70) had a significantly higher odds of being vaccine-hesitant. The qualitative analyses revealed several major themes that contributed to vaccine hesitancy, including concerns about vaccine safety and efficacy, distrust of healthcare providers and the government, and the spread of misinformation through social networks and peers.

Conclusion: A significant proportion of pregnant women in this study were vaccine-hesitant. The major reasons for vaccine hesitancy are concerns about the safety of vaccines and lack of trust for healthcare providers. Policies and programmes should be aimed at improving vaccination behaviour, addressing safety concerns and building trust in vaccination systems.