Passage VII
Bacteria, fungi, and viruses (microorganisms) cause diseases and infections. Disinfectants are chemical agents used on inanimate objects to kill or inhibit the growth of microorganisms. Antiseptics are chemical agents used on the skin to kill or inhibit the growth of microorganisms. Several groups of disinfectants and antiseptics are depicted in Table 1.
The chemical agents that make up disinfectants and antiseptics can be dissolved either in alcohol (forming a tincture) or water (forming an aqueous solution). The effectiveness of a variety of antiseptics against the normal microbial flora of the skin is shown in Figure 1.
39. After you thoroughly wash your hands with plain soap and water for 2 minutes, your hands probably carry:
Your Answer is
Correct Answer is D
Explanation
Look at the solid line representing soap and water in Figure 1. When the abscissa time is 2 min (120 sec), about 90% of the bacteria survive, so it can be said that the bacteria have hardly decreased, and most of them are still alive