Fig. (1) Genome and expression strategies of RVFV. (A) Schematic representation of the three genomic segments L (large), M (medium) and S (small) and the proteins encoded on them. (B) The mRNA transcribed from the M segment contains five in-frame start codons which gove rise to the 78kDa and the 14 kDa proteins, as well as some minor products [13]. Scissor indicate host cell protease sites for cleavage of the polyproteins.