If you take IVM once a fortnight like I did just prior and as the bug was spreading, the symptoms are negligible. It has peaked in our area now,,virtually everyone in the region has been exposed already and I know most have been off work or out of school . But I may continue with the IVM anyway -- no side effects at all so apart from that it can accumulate over time , I see no reason not to. I get more side effects from half a bottle of red.
It is painfully obvious why pharma went so hard on rubbishing IVM which won a nobel prize for it's use in humans.