Factors affecting infectious disease- Agent

Question 1

Facultative pathogenic agents are helped by predisposing factors.

Answer 1

T

Question 2

Stenoxen agents have a wide host range.

Answer 2

F

Question 3

Euryxen agents have a wide host range

Answer 3

T

Question 4

An euryxen agent can infect several host species

Answer 4

T

Question 5

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

Answer 5

F

Question 6

Mutations generally result decrease of the virulence.

Answer 6

T

Question 7

Immunogenicity of the different agents is different

Answer 7

T

Question 8

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

Answer 8

T

Question 9

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

Answer 9

T

Question 10

Virulence of an agent can be characterized with its LD50 value

Answer 10

T

Question 11

Pathogenicity means the ability of the agent to cause disease.

Answer 11

T

Question 12

Virulence means the level of pathogenicity.

Answer 12

T

Question 13

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

Answer 13

F

Question 14

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

Answer 14

T

Question 15

The virulence of the agents is connected to virulence factors.

Answer 15

T

Question 16

Virulence is a stable characteristic of an agent.

Answer 16

F

Question 17

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

Answer 17

T

Question 18

Virulence of a bacterium or virus can be changed spontaneously.

Answer 18

T

Question 19

In case of a secondary infection the agent complicates a primary infection.

Answer 19

T

Question 20

Virulence of a bacterium or virus can be changed.

Answer 20

T

Question 21

The virulence factors help the agents in causing disease

Answer 21

T

Question 22

Virulence variants can occur within a bacterium or virus species.

Answer 22

T

Question 23

Pathogenic variants can occur within a bacterium or virus species.

Answer 23

T

Question 24

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

Answer 24

F

Question 25

Within a pathogenic species no avirulent strains can occur

Answer 25

F