(EN) The invention is directed to an antiviral for administering to a mammalian host (e.g., a human) susceptible to paramyxovirus infection, particularly respiratory syncytial virus (RSV) infection. In certain embodiments, an antiviral molecule of the invention is a polypeptide, a chemokine polypeptide, a chemokine polypeptide fragment, an organic small molecule or a peptide mimetic, wherein the antiviral molecule inhibits or prevents paramyxovirus infection of a mammalian cell.
