"Antiviral effects" refers to the ability of something (such as a medication or natural substance) to inhibit or prevent the growth and spread of viruses within the body. Full definition
A dominant negative mutant of 2 - 5A - dependent RNase suppresses antiproliferative and antiviral effects of interferon. (lerner.ccf.org)
[tab name = «Use / Dosage»] Elderberry concentrated juices or highest concentrated tincture form has proven to have strong antiviral effects since the berries contain proteins that prevent viruses from entering cells. (beneficialbotanicals.com)
Cidofovir has potent antiviral effects in vitro and in vivo against several Herpesviruses of human and veterinary importance. (eyespecialistsforanimals.com)