Tuberculosis (TB) Tuberculosis (TB) Active tuberculosis (TB) is very contagious. The World Health Organization (WHO) estimates that one-third of the world's population is infected with the bacteria that cause TB.
With an average elevation of 6,800 feet, Colorado is the highest state in the United States. A mountain lake outside of the skiers dreamland of Aspen, Colorado. The US is bordered to the north by Canada and Mexico to the South. With 50 states of varied sizes, US is considered the largest nation in America.
The view of the spectacular Mount Elbert, the highest peak in Colorado. Colorado is the highest state in the US in terms of mean elevation, which is 6,800 feet above sea level. The state also has a diverse topography. It has tall, jagged mountain peaks, vast stretches of plains, deserts, mesas, and canyons.