Preliminary tests of antiviral activity of two Inonotus obliquus strains.

Abstract

Tests of the antiviral activity of I. obliquus grown in alder and birch was carried out against human influenza viruses A and B and horse influenza viruses A (strains A/H1N1, A/H3N2, A/Equine2, B/Yamagata/16/18). The black, thin external surface of fungus grown in birch had complete inhibition (100%) against all influenza viruses. The antiviral activity is thought to be mainly due to betulin, lupeol and mycosterols.