Nucleic acid molecules and compositions comprising one or more nucleic acid sequences that encode a consensus filovirus immunogen including a consensus Marburgvirus filovirus glycoprotein MARV GP immunogen, a consensus Ebolavirus Sudan filovirus glycoprotein SEBOV GP immunogen and a consensus Ebolavirus Zaire glycoprotein ZEBOV GP immunogen are disclosed. The coding sequences optionally include operable linked coding sequence that encode a signal peptide. Immunomodulatory methods and methods of inducing an immune response against filovirus, particularly Marburgvirus, Ebolavirus Sudan and Ebolavirus Zaire are disclosed. Method of preventing filovirus infection, particularly infection by Marburgvirus, Ebolavirus Sudan and Ebolavirus Zaire and methods of treating individuals infected with filovirus infection, particularly infection by Marburgvirus, Ebolavirus Sudan and Ebolavirus Zaire are disclosed. Consensus filovirus proteins are disclosed.