To accelerate discovery on Chalara ash dieback disease, sequence data from the ‘interaction transcriptome’ has been made available for ‘crowdsource’ analysis. Two different samples of infected material, AT1 and AT2, have been released thus far.

These examples demonstrate that the fraction of pathogen sequences in the interaction transcriptome may be large. Thus, we do not believe that it is particularly unusual or alarming that fungal sequences are estimated to account for 30% or more of the assembled transcripts in the AT1 sample.