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Information dissemination is one of the most important aspects of routing mechanisms for network management. We study in this paper the problem of disseminating an information by a source trough all the nodes of a network. We consider an epidemic routing protocol in an Ad hoc network with a delayed feedback to the source. Indeed, the source controls the dissemination of the information in the network by sending an anti-packet, like a vaccine. We show that there exists a sufficient condition for stability of the information dissemination in the network depending on the spreading of information in the network and the delay of the feedback to the source.