Disinfection is defined as destruction or removal from an article of all organisms capable of giving rise to infection. A disinfectant is one, which kills the organisms outright. An antiseptic is a substance, which prevent the growth of microorganisms as long as it remains in contact with them and it is relatively bland and nontoxic for superficial application to living tissues. Concurrent disinfection is the immediate destruction of microorganisms present in the infected material throughout the course of illness. The rendering of any article free from bacteria, fungi and their spores and viruses is called sterilization. The drugs administered for treating the diseases must be sterile, IV infusions. The lowest temperature required to sterilize completely a given suspension of bacteria in a given time is called thermal death point. The shortest time required to sterilize given suspension under a known temperature is called thermal death time.