the migrating is a hard problem. we at the iodine forum have had our own nightmares. the bottom line is the overall environment. those who had cleansed and flushed for some time before using iodine had the least problems overall. the other problems were another environmental one - accumulation of fluoride and/or bromide via food and drugs. i believe that general cleansing and diet corrections before hitting the dewormer is a really good idea. the second part of that would be to take enough of the dewormer to kill them instead of warn them to scoot.
still, i cant draw any correlation to deworming and als. a trigger? maybe. a coincidence? probably. an accelerator of inevitable onset? more likely than a trigger. but the cause? not without much more independent evidence, evidence which does not come close to existing.