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.
The virus that causes cold sores is herpes simplex 1, or HSV-1, a cousin to the herpes simplex virus 2 that causes most genital herpes. More than half of all Americans are infected by type 1 herpes by the time they're in their twenties, so common might be another apt description for cold sores.