Abstract
Since the thrust of previous research investigations has been on people's willingness to get immunized against the COVID-19 infection, the underpinning principle of compliance has received very little attention. Addressing the possible drivers and mechanisms influencing vaccine acceptance may provide significant insights for limiting the pandemic. In response, we intend to investigate the influence of decision regret and the consequences of post-vaccination adverse effects on the inclination to undertake booster shots. An electronic survey that was self-administered was conducted in Rawalpindi, Pakistan. The questionnaire was completed by 1,369 participants, with a response rate of 41%. 1,343 of them (98.10%) had received both doses of the COVID-19 vaccination. Besides, the present research has also adopted a mediation model. Our findings demonstrate that unfavorable vaccination responses in healthcare workers significantly affect their likelihood of receiving booster shots. Interestingly, healthcare workers who had adverse experiences after being immunized were more prone to regret their prior immunization decisions, which in response affected their decision to get a booster shot. The motivation to receive the booster dosage and adverse post-vaccination responses were mediated by decision regret. The outcomes suggested indissociable connections between unfavorable vaccination responses, decision regret, and the likelihood of receiving a booster shot. To strengthen immunization acceptance intent and enhance the likelihood of receiving COVID-19 booster shots, it is recommended that awareness of these post-vaccination adverse events be extensively integrated into immunization awareness programs and policy measures supporting booster doses.