nonhuman 20 article 17 antiviral activity 15 unclassified drug 14 antivirus agent 13 plant extract 13 Antiviral Agents 12 controlled study 11 animal cell 10 virus replication 10 meliacine 9 plant leaf 9 Plant Extracts 8 Virus Replication 8 mouse 8 priority journal 8 Animals 6 animal experiment 6 animal model 6 virus inhibition 6 Herpes simplex virus 1 5 Meliacine 5 Support, Non-U.S. Gov't 5 animal tissue 5 Melia azedarach 4 Melia azedarach L 4 Melia azedarach L. 4 Mice 4 Plant antiviral 4 drug effect 4