QUIZ 1. What least likely affects the contagiousness of an infectious disease? a. How deadly the disease is b. Characteristics of the host c. Characteristics of the pathogen d. Route of infectivity Answer: a. Each of these will affect the contagiousness of an infectious disease except for the deadliness of the disease itself. Minor or major infections can be equally contagious. 2. What disease is infectious in origin but noncommunicable? a. Ebola virus b. Clostridium tetani or tetanus c. Hepatitis D d. Cholera Answer: b. Clostridium tetani causes tetanus, which comes from soil spores. The disease comes through an open wound but cannot be passed from person to person or from animal to person. The other diseases are directly or indirectly communicable. 3. What is true of Koch’s original postulates? a. It is valid in all cases of an infectious disease. b. It applies only to bacterial diseases. c. There are several exceptions to these postulates. d. The only postulate that is incorrect is the second postulate. Answer: c. There are several exceptions to these postulates that make it difficult for them to be used for all infectious diseases. It can apply to many diseases that are not bacterial. More than one postulate can be invalid.
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