James Knight, I just found this as well.

A comprehensive review of the antibacterial, antifungal and antiviral potential of essential oils…

Several essential oils have antiviral activities against many RNA and DNA viruses, such as type 1 and type 2 herpes simplex virus (HSV-1 and HSV-2), dengue virus type 2, influenza virusadeno virus type 3, poliovirus, Junin virus, and coxsackievirus B1.