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Before United States citizens travel to Africa, a(n) _____ for yellow fever is required.

immunity
immunization
viral detection
antibiotic

2 Answers

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Before United States citizens travel to Africa, a(n) immunization for yellow fever is required.
User Nepomuk Pajonk
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Before United States citizens travel to Africa, an immunization for yellow fever is required.
User Pedriyoo
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