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.
Common trigger for cold sores include: 1  an infection (for example a cold or the flu) 2  emotional and physical stress. 3  having a high fever.  being tired or 1  exhausted. injury to the lips or mouth.  hormonal changes (including menstruation in 1  women) exposure to sunlight.