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Welkin replies:

From what I’ve read so far (starting with the CDC yellow fever site http://www.cdc.gov/ncidod/dvbid/yellowfever/index.html ) there does seem to be a re-emergence of YF in formerly endemic countries in recent decades, but I also don’t think the virus ever “went away”. I think therefore it probably has more to do with lack of public health infrastructure, and/or interruption of community health measures by war, economics, etc, than a biological change in the virus. In this regard, it is similar to other vaccine preventable diseases, like measles and polio, which still occur with some frequency when and where vigilance and application of vaccine falls short.

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