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 L Lysine Injection, 100mg mL Olympia Pharmaceuticals Development of a highly effective combination monoclonal antibody therapy against Herpes simplex virus Journal of Biomedical Science Springer Nature Link Physiological costs of infection: herpesvirus replication is linked to blood oxidative stress in equids Scientific Reports Herpes Simplex Virus 1 Induced Ferroptosis Contributes to Viral Encephalitis mBio