Figure 2.

Phylogenetic tree of RVFV generated by the maximum likelihood method with bootstrap (500 replicates) based on 3885 nucleotides of the M genomic segment of RVFV. Analysis involved 103 nucleotide sequences available in GenBank. The compressed Cluster 1 includes 47 sequences from Kenya, South Africa, Madagascar, and Tanzania, collected in the period 2006–2009; Cluster 2: ten sequences from Kenya, Sudan, and Uganda, collected in 2006–2016; Cluster 3: three sequences from Kenya and Saudi Arabia collected in 1998–2001; Cluster 4: six sequences from C.A.R., Zimbabwe, and Guinea, collected in 1969–1985; Cluster 5: thirteen sequences from Zimbabwe, Egypt, and Madagascar, collected in 1974–1979. Strain names and accession numbers of the sequences included in the compressed clusters are listed in Table S3.