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Answer:
What I heard was that people in the science laboratory in china "accidently" let loose a virus that they were studying, which also led to that person in contact with it to go out and spread it without knowing. Causing the virus to spread across all the world within a few months.
That is my explanation! \_(ツ)_/
The sense of togetherness. Almost all countries in Africa have close-knit communities. this might be considered as one of the factors.
More people going into urban areas for jobs in factories