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.
What causes cold sores? âCold sores are caused by the herpes simplex virus type 1, which is transmitted by skin-to-skin contact and may lie dormant for months,â says Dr. Jaggi Rao, an Edmonton-based dermatologist and associate clinical professor of dermatology at the University of Alberta.