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Brazilian Health Minister Eduardo Pazulo announced on the 7th that the Brazilian federal government has signed an agreement with the Butantan Institute in São Paulo to purchase 100 million doses of the Kelifou coronavirus vaccine developed by Beijing Kexing Zhongwei Biotechnology Co., Ltd. Pazulo said that the Butantan Institute will deliver the first 46 million doses of vaccine by the end of April, and the remaining 54 million doses are scheduled to be delivered within this year.