In this photo taken Wednesday, Dec. 11, 2019, health officials vaccine residents of the Malawi village of Tomali, where young children become test subjects for the world's first vaccine against malaria. Babies in three African nations are getting the first and only vaccine for malaria in a pilot program. World health officials want to see how well the vaccine works in Malawi, Ghana and Kenya before recommending its wider use. (AP Photo/Jerome Delay)
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