Factors affecting infectious disease- Agent Flashcards
1) Facultative pathogenic agents are helped by predisposing factors
true
2) Stenoxen agents have a wide host range
false
3) Euryxen agents have a wide host range
true
4) An euryxen agent can infect several host species
true
5) There is no minimum number of agents necessary to infection, because they can replicate in the host
false
6) Mutations generally result decrease of the virulence
true
7) Immunogenicity of the different agents is different
true
8) There is a minimum number of each agent that is necessary to infect animals
true
9) A minimum amount of bacteria or viruses is needed to a successful infection
true
10) Virulence of an agent can be characterized with its LD50 value
true
11) Pathogenicity means the ability of the agent to cause disease
true
12) Virulence means the level of pathogenicity
true
13) The amount of the agent does not influence the outcome of the infection, since it can replicate in the host
false
14) In the case of optimal way of infection the least amount of agent can cause disease
true
15) The virulence of the agents is connected to virulence factors
true
16) Virulence is a stable characteristic of an agent
false
17) The way of the infection (entrance of the agents) can influence its outcome
true
18) Virulence of a bacterium or virus can be changed spontaneously
true
19) In case of a secondary infection the agent complicates a primary infection
true
20) Virulence of a bacterium or virus can be changed
true
21) The virulence factors help the agents in causing disease.
true
22) Virulence variants can occur within a bacterium or virus species
true
23) Pathogenic variants can occur within a bacterium or virus species
true
24) Species specific resistance can be overcome by increasing the number of agents
false
25) Within a pathogenic species no avirulent strains can occur
false
