2. The number of organisms necessary to insure infection is termed the Infectiou

Question

2. The number of organisms necessary to insure infection is termed the Infectious dose fatal number minimum lethal dose. pathogenic number. 13. The first Stop in the establishment of infection is that the organism must A) invade host tissues. B) attach to host cells. C) evade phagocytes. D) produce toxins. 14. The chemical nature of endotoxins is that of a A) protein. B) nucleic acid C) lipid. D) lipopolysaccharide. 15. The chemical nature of exotoxins is that of a A) protein. B) carbohydrate. C) lipid. D) lipopolysaccharide. 16. Attenuated agents A) may induce immunity after a single dose. B) may cause disease in immunocompromised individuals. C) multiply in the body. D) may revert or mutate to disease-causing strains. E) all of the above 17. The Salk vaccine A) contains live attenuated virus. B) contains inactivated virus. C) contains a portion of the polio virus. D) occasionally causes disease.

Explanation / Answer

12. The number of organisms necessary to insure infection is termed as Infection dose.

13. The first step in the establishment of infection is that the organism must attach to host cells.

14. The chemical nature of endotoxins is that of lipopolysaccharide.

15. The chemical nature of exotoxins is that of protein.

16. Attenuated agents include all of these.

17. Salk vaccine contains inactivated virus

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