Rift Valley Fever (RFV) virus is an arthropod-borne virus endemic to Africa that infects humans and animals that is transmitted predominantly by mosquitoes.  During human infections, symptoms can range from benign fever to severe encephalitis and fatal hepatitis with hemorrhagic fever.   The Bunyaviridae family of viruses to which the RVF virus belongs are spherical enveloped viruses with a tripartite RNA genome of negative or ambisense polarity.  The three segments are referred to as the L, M, and S segments.  The L and M segments are negative polarity and code fore the L-dependent RNA polymerase and glycoprotein precursor respectively.  The S segment is of ambisense polarity and encodes the nucleoprotein and non-structural proteins.  This RVF virus antibody was derived from a peptide sequence near the center of the polyprotein precursor translated from the M segment.  It will therefore detect both the precursor and the Glycoprotein G1.