Fair to say - you don't want it!
Reading Mayo Clinic, the causes are wide and varied.
It'll never be proven (or disproved) that the vaccine trial triggered a single case.
www.mayoclinic.org/diseases-conditions/transverse-myelitis/symptoms-causes/syc-20354726
The article above does not say how many or the planed 30 000 participants have received the vaccine.
It also has not yet been disclosed if the test subject got "the real thing, or the placebo.
Given the long list of conditions that can trigger it, it'd be surprising that 1 in 30000 random people
didn't develop some nasty condition completely unrelated to being part of the program.