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A health worker administers a polio vaccine to a child at a school in Peshawar, Pakistan, Monday, Sept. 9, 2024. (AP Photo/Muhammad Sajjad)

A health worker administers a polio vaccine to a child at a school in Peshawar, Pakistan, Monday, Sept. 9, 2024. (AP Photo/Muhammad Sajjad)

A health worker administers a polio vaccine to a child in a downtown area of Lahore, Pakistan, Monday, Sept. 9, 2024. (AP Photo/K.M. Chaudary)

A health worker administers a polio vaccine to a child in a downtown area of Lahore, Pakistan, Monday, Sept. 9, 2024. (AP Photo/K.M. Chaudary)

A police officer stands guard as a health worker, right, administers a polio vaccine to a child in a neighbourhood of Peshawar, Pakistan, Monday, Sept. 9, 2024. (AP Photo/Muhammad Sajjad)

A police officer stands guard as a health worker, right, administers a polio vaccine to a child in a neighbourhood of Peshawar, Pakistan, Monday, Sept. 9, 2024. (AP Photo/Muhammad Sajjad)

A health worker administers a polio vaccine to a child in a market in downtown area of Lahore, Pakistan, Monday, Sept. 9, 2024. (AP Photo/K.M. Chaudary)

A health worker administers a polio vaccine to a child in a market in downtown area of Lahore, Pakistan, Monday, Sept. 9, 2024. (AP Photo/K.M. Chaudary)