Numerous studies around the world have shown a re-emergence of diphtheria cases and an increasing trend of cases after the pandemic, such as in Pakistan ( Saeed et al., 2023 ), India ( World Health Organization, 2023 ), Peru ( Mezones-Holguin et al., 2021 ), and Nigeria ( Ibrahim et al., 2022 ).
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Assessing the impact of booster vaccination on diphtheria transmission: Mathematical modeling and risk zone mapping.
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