Leg pain is also frequently a sign of injury, such as the following: Muscle strain is a common injury that happens when the muscle fibers tear as a result of overstretching. It often occurs in the larger muscles, such as the hamstrings, calves, or quadriceps.
medical Definition of superinfection : a second infection superimposed on an earlier one especially by a different microbial agent of exogenous or endogenous origin that is resistant to the treatment used against the first infection
Extensive Definition. A superpower is a state with a leading position in the international system and the ability to influence events and project power on a worldwide scale; it is traditionally considered to be one step higher than a great power.he term superpower was used to describe nations with greater than Great Power status as early as 1944, but only gained its specific meaning with regard to the United States and the Soviet Union after World War II.