  In this paper, we study the control of the traffic-driven epidemic spreading
by immunization strategy. We consider the random, degree-based and
betweeness-based immunization strategies, respectively. It is found that the
betweeness-based immunization strategy can most effectively prevent the
outbreak of traffic-driven epidemic. Besides, we find that the critical number
of immune nodes above which epidemic dies out is increased with the enhancement
of the spreading rate and the packet-generation rate.
