Lately I have been approached several times about the incidence of fever post vaccination. Data suggests that it is a rare and benign issue at best. In a placebo controlled trials it was no more frequent than in the control group.
Placebo-controlled trials demonstrated that among older persons and healthy young adults, administration of TIV is not associated with higher rates for systemic symptoms
Therefore the presence of low grade fever or the concern for fever should not be a contraindication for vaccination.
Also of interest is the recurring concern for Guillian-barre. In this series there were no cases in over 4 million doses administered.