Cold sore triggers vary from person to person, but HSV is an opportunistic infection. That means it rears its ugly head when, for whatever reason, your immune system is too weak to Effect of the N butanoyl glutathione (GSH) derivative and acyclovir on HSV 1 replication and Th1 cytokine expression in human macrophages springermedicine.com Using CSF Proteomics to Investigate Herpesvirus Infections of the Central Nervous System Genital Herpes: Causes, Symptoms, Treatments Biom Probiotics