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.
Causes. Cold sores are usually caused by herpes virus, which can lay dormant in the body and becomes active later when something triggers it. Two members of the herpes virus family are herpes simplex virus 1 (HSV-1) and herpes simplex virus 2 (HSV-2). Once infected both persist in the body for life.