So we have an hyperacute febrile response that has led to seizures, from a component of the vaccine.

It may be for example that the viral components have not been attenuated properly,ie made dead if you like. It is important not to eliminate every possibility of cause. For example, some and I mean some, are caused by still sick children being vaccinated. So many variables to consider

I can't see any reason to cover anything up.
The safety measures have been initiated as published. The process of assessing all patients and vaccine stock and supply and manufacturer processes must take time I imagine.