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.
1 Cold sores are usually caused by a type of herpes virus and are very contagious. 2  The first infection often occurs in children, sometimes without symptoms, and may be confused with a cold or flu. 3  Once a person is infected, the virus stays in the body, occasionally causing recurrent attacks.