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A health worker, center, administers a polio vaccine to a child in a school, in Karachi, Pakistan, Monday, Oct. 28, 2024. (AP Photo/Fareed Khan)

A health worker, center, administers a polio vaccine to a child in a school, in Karachi, Pakistan, Monday, Oct. 28, 2024. (AP Photo/Fareed Khan)

A health worker, left, marks a finger of a child after giving a polio vaccine at a neighborhood of Jalalabad, east of Kabul, Afghanistan, Tuesday, Oct. 29, 2024. (AP Photo/Shafiullah Kakar)

A health worker, left, marks a finger of a child after giving a polio vaccine at a neighborhood of Jalalabad, east of Kabul, Afghanistan, Tuesday, Oct. 29, 2024. (AP Photo/Shafiullah Kakar)

A health worker administers a polio vaccine to a boy at a local Madrassa, at a neighborhood of Jalalabad, east of Kabul, Afghanistan, Tuesday, Oct. 29, 2024. (AP Photo/Shafiullah Kakar)

A health worker administers a polio vaccine to a boy at a local Madrassa, at a neighborhood of Jalalabad, east of Kabul, Afghanistan, Tuesday, Oct. 29, 2024. (AP Photo/Shafiullah Kakar)

A health worker administers a polio vaccine to a child inside a Taxi in the city of Jalalabad, east of Kabul, Afghanistan, Tuesday, Oct. 29, 2024. (AP Photo/Shafiullah Kakar)

A health worker administers a polio vaccine to a child inside a Taxi in the city of Jalalabad, east of Kabul, Afghanistan, Tuesday, Oct. 29, 2024. (AP Photo/Shafiullah Kakar)

A health worker administers a polio vaccine to a child at a neighborhood of Jalalabad, east of Kabul, Afghanistan, Tuesday, Oct. 29, 2024. (AP Photo/Shafiullah Kakar)

A health worker administers a polio vaccine to a child at a neighborhood of Jalalabad, east of Kabul, Afghanistan, Tuesday, Oct. 29, 2024. (AP Photo/Shafiullah Kakar)

A health worker administers a polio vaccine to a child at a neighborhood of Jalalabad, east of Kabul, Afghanistan, Tuesday, Oct. 29, 2024. (AP Photo/Shafiullah Kakar)

A health worker administers a polio vaccine to a child at a neighborhood of Jalalabad, east of Kabul, Afghanistan, Tuesday, Oct. 29, 2024. (AP Photo/Shafiullah Kakar)

A police officer stands guard as a health worker, center, administers a polio vaccine to a child in a neighbourhood of Peshawar, Pakistan, Monday, Oct. 28, 2024. (AP Photo/Mohammad Sajjad)

A police officer stands guard as a health worker, center, administers a polio vaccine to a child in a neighbourhood of Peshawar, Pakistan, Monday, Oct. 28, 2024. (AP Photo/Mohammad Sajjad)

A health worker, right, administers a polio vaccine to a child at a neighborhood of Jalalabad, east of Kabul, Afghanistan, Tuesday, Oct. 29, 2024. (AP Photo/Shafiullah Kakar)

A health worker, right, administers a polio vaccine to a child at a neighborhood of Jalalabad, east of Kabul, Afghanistan, Tuesday, Oct. 29, 2024. (AP Photo/Shafiullah Kakar)