ch. 14 koch's postulate

Question 1

koch’s postulate

Answer 1

used to demonstrate how a pathogen causes a disease

Question 2

koch’s postulate rule 1

Answer 2

same pathogens must be PRESENT in every case of the disease

Question 3

koch’s postulate rule 2

Answer 3

pathogen must be ISOLATED from the disease host and grown in pure culture

Question 4

koch’s postulate rule 3

Answer 4

pathogen from pure culture must CAUSE the disease when its inoculated into a healthy laboratory animal

Question 5

koch’s postulate rule 4

Answer 5

pathogen must be ISOLATED from inoculated animal and must be shown to be the original organism

Question 6

limitation and current guide in rule 1(present)

Answer 6

asymptomatic individuals

current guides– epidemiological tools

Question 7

limitation and current guide in rule 2 (isolation)

Answer 7

not all pathogens can be cultured –viruses

current guide– molecular techniques can be used to demonstrate the presence of pathogen

Question 8

limitation in rule 3 (CAUSE)

Answer 8

some microorganisms may lose their pathogenicity after culture

Question 9

limitation is last step of koch’s postulate (isolation)

Answer 9

not all infectious diseases have animal models