Frag-Virus: a new term to distinguish presumptive viruses known primarily from sequence data

Excerpt

The wide availability of PCR-based methods for the amplification of nucleic acids homologous to known viral genomes plus automated DNA sequencing have led to explosive growth of a new field, 'proxy' virus isolation. Typically, genomic fragments are amplified and subjected to phylogenetic analysis showing that they are related to, but distinct from, known 'bona fide' viruses. These "new viruses" are now commonly reported in the virological literature and are too numerous to cite here, two studies are given as typical examples [1, 2]. Although unintentional, these reports may, mislead the readership of scientific journals and the general press. Having no distinction between preliminary genome-based evidence and conclusive proof by biological isolation and characterization of a replication-competent virus blurs the meaning of new virus. …