Moderna batches belong to two main groups - 20A or 21A - the 20A group is much more toxic. Infact all of the batches ptroducing more than 1780 adverse reaction reports - all of those batches have batch codes ending in 20A. Most of the batches producing fewer than 1780 ADRs end in 21A.
Within the 20A group there are 4 subgroups J, K, L, M
Within the 21A group there are 6 subgroups A, B, C, D, E, F
In both cases it is found that as the alphabet ascends, then the toxicity decreases in steps.
What this means is - the number of adverse reactions is not random or accidental. Rather it varies with the toxicity of the batch - and different toxic levels have been assigned to different letters of the alphabet -
J & K both very toxic
L more toxic than M
M more toxic than A
A more toxic than B
B more toxic than C
C more toxic than D
D, E, F all about the same toxicity