Polio vaccine is now given in a two-step process, first inactivated poliovirus and then live oral polio vaccine. Why is such a two-step process used?
A. It allows health professionals to promise that children cannot get polio from the immunization process.
B. Live oral polio vaccine for the second dose is cheaper than giving both doses with inactivated poliovirus
C. It is more risky for employees to grow and prepare live polio vaccine than inactivated poliovirus.
D. Some newly immunized individuals caught polio from the live vaccine when only live vaccine was given.
Question 2
Jacob Henle developed scientific criteria to link an organism to its specific disease. What are his criteria, which we still use today?
A. Give samples of the organism to three different researchers and see if all three researchers can grow it successfully.
B. Grow the organism on the diseased tissue and then see if, when spread on normal tissue, the organism continues to grow.
C. Identify microorganisms under a microscope and grow them on the tissue that the disease usually infects.
D. Identify the organism, isolate the organism, and see if the organism produces disease.
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