Will Falconer, DVM Moderator
A very late reply, but the answer is no. Those who study the immune system far more deeply than I have told me "a stimulated immune system is a balanced immune system."
When it's more balanced, it means it's more effective at its prime job: ferreting out the "foreigners" which include not only pathogens like viruses and bacteria but the cancerous cells that arise quite regularly in all of us.