And they say that these mutations are definitively associated with either lineage A or lineage B — which discredits the idea that the corresponding viral genomes date to an intermediate

stage of evolution between the two lineages, the team said. The team suggest that a laboratory or computer error probably occurred in sequencing one of the two mutations in these

"intermediate" genomes. However, the team countered that even if some of the genomes were sequenced correctly, other parts of the same genomes, or the locations from which the

samples were collected, still clearly indicate that they belong to only one or the other lineage. (_This story was published from a syndicated feed. Only the headline and picture has been