Salmon-Challis National Forest, Idaho. It is the second largest National Forest in the continental United States. In 1876, the US Congress created an office to evaluate the conditions of forests in the US. In 1891, President Theodore Roosevelt assigned the control of the newly named, national forests to the US Forest Service.
Cold sores are caused by certain strains of the herpes simplex virus (HSV). HSV-1 usually causes cold sores.
Most cold sores are caused by Herpes Simplex - Type 1. 1  Herpes simplex virus - Type 1. (HSV1) Herpes type 1 generally only infects those body tissues that lie above the waistline and it's this virus that causes cold sores in the majority of cases. 2  Herpes simplex virus - Type 2. (HSV2)