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A health worker opens a cholera vaccine in Blantyre, southern Malawi, Thursday, Jan. 22, 2026. (AP Photo/Thoko Chikondi)

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A health worker administers a cholera vaccine in Blantyre, southern Malawi, Thursday, Jan. 22, 2026. (AP Photo/Thoko Chikondi)

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A health worker registers children for cholera vaccination in Blantyre, southern Malawi, Thursday, Jan. 22, 2026. (AP Photo/Thoko Chikondi)

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FILE - Health department staff members enter the Andrews County Health Department measles clinic carrying doses of the measles, mumps and rubella vaccine, Tuesday, April 8, 2025, in Andrews, Texas. (AP Photo/Annie Rice, File)

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FILE - Jonathan Dumke, a senior forensic chemist with the Drug Enforcement Administration, holds vials of fentanyl pills at a DEA research laboratory on Tuesday, April 29, 2025, in Northern Virginia. (AP Photo/Mark Schiefelbein, file)