Yes ? need?: The yellow fever vaccine becomes effective ~10 days after administration and is expected to remain so for ten years. If traveling in a yf area you may need a yf vaccine certificate so getting another yf vac may be needed if you have not kept up with yours. For specifics see: www.Cdc.Gov/vaccines/vpd-vac/yf/default.Htm.
Answered 5/17/2012
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