Our onc told us that, in order for a vaccine to be effective, a person has to be able to mount a decently robust immune response to it.  Thus, when on steroids (immuno-suppressants) or when the WBC count is too low, the vaccine may likely be ineffective.  Sorry to be the bearer of potentially bad news.  However, perhaps it's just a question of lessening efficacy of the vaccine, and that as long as SOME immune response can be mounted, there will be some resistance built up against the virus.  Perhaps it's better than no resistance at all?

I wouldn't know firsthand since we can't seem to get our hand on the inactivated vaccine around here...(even our oncs haven't been able to get vaccinated).

Ann