Disoxaril is the antipicornavirus drug. It is an isoxazole heterocyclic compound and a member of the antiviral series commonly referred to as WIN compounds. Disoxaril inhibits enterovirus replication by binding to the hydrophobic pocket within the VP1 coat protein, thus stabilizing the virion and blocking its uncoating. The amino acid sequence of a large VP1 196-258 peptide (disoxaril-binding region) of CVB1/RESISTANT was significantly different from that of the CVB1/SOF (sensitive). Crucially important changes in CVB1/RES were two point mutations, M213H and F237L, both in the ligand-binding pocket. Treatment with disoxaril in newborn mice infected with Coxsackie B1 virus, for 10 days post virus inoculation decreased the virus titer in the mouse brain till day 7.