Today, one of the topical areas of research is the search for antiviral drugs to fi ght against virus-associated oncological manifestations. One of the viruses for which a role in the transformation of cells is proved is Epstein-Barr virus (EBV), which is associated with a variety of lymphoproliferative diseases. The use of drugs that not only inhibit the replication of the virus but also stimulate the elimination of tumor cells is important for the treatment of tumors associated with the viruses. The purpose of this work was to investigate the ability of silver and gold nanoparticles to inhibit EBV replication under conditions of chronic infection. Methods. The objects of the study were 5 to 20 nm gold and silver nanoparticles stabilized with tryptophan, sodium dodecyl sulfate, and citrate. Th e investigations were performed in P3HR-1 (virus-productive) lymphoblastoid cells. MTT-assay, neutral red and trypan blue dyeing were used to study cell viability. Antiviral activity was estimated by the real-time polymerase chain reaction (RT-PCR). Transmissive electron microscopy was used to visualize nanoparticle-virus binding. Results. It was found that nanoparticles of silver and gold s
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