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contamination rather than infection
means the lab personnel, cleaning crew, etc may have inadvertently contaminated the samples with the virus.This is an old argument which this study refutes...if it was only contamination it would not spread to other cells.
The fine point is that they could show that the cells "support replication" but they have yet to show "functional replication" which is I think what their next experiment will attempt to prove.
Infection seems to have been proven, whether it can sustain itself with functional replication is next on their scientific agenda
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