I was poking through Q drops with the word "vaccine" and found only 3 This is the earliest, its from April 4, 2018.
I seems like a list of "Mass Ext Events…." is found in the drop and one of them is PHARMA [CLAS-D]
Perhaps that is the mRNA shot that is happening now?
As I pondered the rest I put my other thoughts directly on the drop, see graphic.