virus

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Recall also that AAV has generally low immunogenicity, so there was unlikely to be any major immune response to the introduction of the virus-like particles, and that these particles are incompetent of further replication, since they neither have a helper virus nor are carrying the normal AAV genes.
Alphasatellites have no obvious contribution to symptoms induced by begomovirus-betasatellite disease complexes and appear to affect betasatellite replication but do not affect helper virus replication.
These molecules are approximately 1350 nt in length, are unrelated in sequence to the helper virus and require the helper virus for insect transmission and movement in the plants.