"An extensive clinical and research investigation, including cytokine analysis, whole blood cytometry by time of flight, and whole exome sequencing, did not reveal a definitive explanatory mechanism"
Also from the article you linked...if I'm reading this correctly,this is saying the doctors involved in this study could not determine a cause for any of the effects the patients experienced. It's not exactly airtight to definitively blame a vaccine for anything, when even the medical professionals you yourself are citing did not feel comfortable in doing so.
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