FILE - In this Oct. 30, 2009 file photo, a mother holds her baby receiving a new malaria vaccine as part of a trial at the Walter Reed Project Research Center in Kombewa in Western Kenya. The World Health Organization said Tuesday April 23, 2019, that Malawi has become the first country to introduce a pilot program vaccinating children against malaria using the only licensed vaccine to protect against the mosquito-spread disease. Although the vaccine only protects about one third of children who are immunized, those who get the shot are likely to have less severe cases of malaria. (AP Photo/Karel Prinsloo, File)
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