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
Superinfection exclusion. Superinfection exclusion is a phenomenon in which a preexisting viral infection prevents a secondary infection with the same or a closely related virus. This phenotype is often poorly understood, and may reflect programmed virus superinfection or a kind of antiviral state of the infected cell.Some bacterial viruses encode proteins to achieve superinfection exclusion.These viral proteins can interfere with DNA release into the host cytoplasm or modify the entry receptor. They can also act as inhibitors of viral peptidoglycan degradation enzymes thereby preventing entry of incoming phages.his phenotype is often poorly understood, and may reflect programmed virus superinfection or a kind of antiviral state of the infected cell. Some bacterial viruses encode proteins to achieve superinfection exclusion.