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Seven new inorganic heteropolyanions were tested for their antiviral activity. One of these, sodium 12-tungstoborate, was found to protect mice from Semliki forest virus and mouse embryo fibroblast monolayers from vaccinia virus infections. In mice these heteropolyanions exhibited no synergistic antiviral activity with the interferon inducing mycoviral double-stranded RNA.

Hexagonal virus-like particles (VLPs) measuring 45 nm across were detected in mycelial extracts from Trichothecium roseum Himachal strain, the source fungus for the production of T-poly (Trichothecium polysaccharide), a known inhibitor of plant viruses. VLPs were found to contain double-stranded RNA (ds RNA) and the purified ds RNA was capable of inhibiting tobacco mosaic virus infection in Nicotiana glutinosa plants. Active preparations of T-poly were found to contain traces of ds RNA, probably of mycoviral origin.