? CHAPTER 1 Introduction Background of the Study Zika virus infection was declared a public health emergency in 2016. Zika virus infections have been present in Africa and Asia since the 1940s and have since […]

2. At the beginning of the 20th century, almost the entire territory of Africa was colonized by France, Germany, England, Spain, Portugal and Belgium. Only Ethiopia and Liberia were independent. 3. In Africa, live most […]


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