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Workers unload a batch of COVID-19 vaccines developed by the Chinese pharmaceutical company Sinovac at Cardinal Bernadin Gantin International Airport in Cotonou, Benin, March 21, 2021. A batch of coronavirus vaccine developed by the Chinese pharmaceutical company Sinovac arrived in Cotonou, the economic capital of Benin, on Sunday evening. (Photo by Seraphin Zounyekpe/Xinhua)