NeLV was first described in 1972. In 2004 it was placed in the
Carlavirus genus within the family
Flexiviridae. When that family was split in 2009,
Carlavirus and NeLV were placed in the family
Betaflexiviridae.
Narcissus symptomless virus Narcissus symptomless virus was described as a separate virus
taxon in 2006. Subsequently, in 2016 it became apparent that the nucleotide sequence identities between Narcissus symptomless virus and the partial genome sequences of Nerine latent virus are 94-97% for
coat protein and
replicase, well above the threshold 72% set for
speciation of
flexiviruses. Consequently, these two viruses can be considered to be the same taxon, and since NeLV has priority,
Narcissus symptomless virus should be reduced to a
synonym. == References ==