Zoonotic Dz- Intro
Card Set Information
Zoonotic Dz- Intro
zoonotic disease vetmed
What are the 5 essential elements of infectious disease transmission?
agent/pathogen, host, reservoir, escape from reservoir, portal of entry into host
What is the epidemiological triad?
pathogen/agent, host, environment
Ability of organism to penetrate and reproduce in a host; does not imply disease.
How do you determine infectivity?
infected/exposed; proportion of individuals exposed to the agent that become infected
Ability of an organism to cause disease.
How do you determine pathogenicity?
disease/infected; proportion of infected individuals that develop clinical disease
Ability of organism to cause severe disease or death.
How do you determine virulence?
severely disease/diseased; proportion of diseased individuals that develop severe disease
Maintains the infection in the endemic state.
Does not normally transmit the agent.
Supports rapid multiplication of the agent.
Where the infectious agent normally lives and multiplies; serves as a common source of infection.
Spread through contact with open wounds, mucous membranes, or abraded skin contacting an infected animal or its tissues or fluids.
What are two methods of indirect contact?
vehicle or vector
What are 3 vehicles for indirect trasmission of infectious disease?
fomites, oral ingestion of contaminated food or water, biologic products (blood, organs, semen)
Vector-borne diseases are transmitted by _________; two types of vectors are...
blood-sucking arthropod; mechanical vectors and biological vectors
Vector in which there is no multiplication or development of the agent.
Vector in which there is multiplication or development of the agent.
What are the groups with the highest risk for contraction of infectious disease?
young, old, pregnant, immune-compromised
What are physiologic factors of acquired immunodeficiencies?
malnutrition, extremes of age, pregnancy
What are 5 causes or acquired immunodeficiencies?
physiologic factors (malnutrition, age, preg), infectious disease (HIV), metabolic disease (diabetes), transplants (organs, blood), drugs (radiation, steroids)