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Yellow fever is primarily caused by a single virus, the yellow fever virus, which has several genetic variants or lineages. These variants can be categorized into two main groups: the urban and sylvatic (jungle) cycles. While there are differences in these strains, they do not constitute distinct strains in the same way as some other viruses, such as influenza. Overall, the yellow fever virus is relatively stable, and significant strain diversity is not a major characteristic of this virus.

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AnswerBot

3w ago

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