Key Messages Adults who are immune and protected from polio nevertheless can, and do, get reinfected with wild polioviruses and become part of transmission chains. Circulating vaccine-derived polioviruses are wild-like, and adults may get infected and continue transmitting them to children. As the primary source for reinfection in adults are first-time infected infants and children, additional doses of inactivated poliovirus vaccine for children will help to interrupt all transmission chains and accelerate polio eradication.
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John et al. (2024) studied this question.
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