Factors affecting infectious disease- Agent

Question 1

1) Facultative pathogenic agents are helped by predisposing factors

Answer 1

true

Question 2

2) Stenoxen agents have a wide host range

Answer 2

false

Question 3

3) Euryxen agents have a wide host range

Answer 3

true

Question 4

4) An euryxen agent can infect several host species

Answer 4

true

Question 5

5) There is no minimum number of agents necessary to infection, because they can replicate in the host

Answer 5

false

Question 6

6) Mutations generally result decrease of the virulence

Answer 6

true

Question 7

7) Immunogenicity of the different agents is different

Answer 7

true

Question 8

8) There is a minimum number of each agent that is necessary to infect animals

Answer 8

true

Question 9

9) A minimum amount of bacteria or viruses is needed to a successful infection

Answer 9

true

Question 10

10) Virulence of an agent can be characterized with its LD50 value

Answer 10

true

Question 11

11) Pathogenicity means the ability of the agent to cause disease

Answer 11

true

Question 12

12) Virulence means the level of pathogenicity

Answer 12

true

Question 13

13) The amount of the agent does not influence the outcome of the infection, since it can replicate in the host

Answer 13

false

Question 14

14) In the case of optimal way of infection the least amount of agent can cause disease

Answer 14

true

Question 15

15) The virulence of the agents is connected to virulence factors

Answer 15

true

Question 16

16) Virulence is a stable characteristic of an agent

Answer 16

false

Question 17

17) The way of the infection (entrance of the agents) can influence its outcome

Answer 17

true

Question 18

18) Virulence of a bacterium or virus can be changed spontaneously

Answer 18

true

Question 19

19) In case of a secondary infection the agent complicates a primary infection

Answer 19

true

Question 20

20) Virulence of a bacterium or virus can be changed

Answer 20

true

Question 21

21) The virulence factors help the agents in causing disease.

Answer 21

true

Question 22

22) Virulence variants can occur within a bacterium or virus species

Answer 22

true

Question 23

23) Pathogenic variants can occur within a bacterium or virus species

Answer 23

true

Question 24

24) Species specific resistance can be overcome by increasing the number of agents

Answer 24

false

Question 25

25) Within a pathogenic species no avirulent strains can occur

Answer 25

false