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
Despite these advances, the most responsible answer to the question is yes. For years HIV reinfection (or superinfection as it is sometimes called) has been a consequence of condom-less sexual encounters between two HIV infected people. Simply put, reinfection occurs when a person with HIV gets infected with a different viral strain through sexual contact (or shared needle use) with another HIV-infected person. The consequence of reinfection is that the new viral strain may have genetic mutations that are resistant to the drugs you are taking.