Maximum clade credibility (MCC) tree for the long (L) segment.

Relationship among 126 strains of RVFV isolated from different localities and countries. Samples from Mauritania and Senegal are shown by green and yellow dots respectively. The recurrent independent clustering of green and yellow dots suggests multiple introductions of RVFV into these countries throughout the 20^th century. Posterior probability values greater than 90% are shown near tree nodes.