RFK Jr. Plan to Test a Vaccine in West African Babies Is Blocked NYT: Science By:Stephanie Nolen and Christina Jewett 23 January 2026 at 11:50 A planned U.S.-funded study of a hepatitis B vaccine drew widespread condemnation from researchers. Now the host country says it cannot proceed. © Rebecca Blackwell/Associated PressEach year thousands of babies born in Guinea-Bissau, one of the world’s least developed countries, are exposed to hepatitis B, a virus that can cause severe liver damage and cancer.
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