Flashcards in Chapter 13 Agents of Infectious Disease Deck (79)
A subclinical disease"
has no observable signs
What definition is most accurate for the term "disease"?
An altered physiological state in which the function of a tissue, organ, or body system has been impaired.
A Gram-positive bacterium has a thin internal cell wall
A bacteria with cilia has:
hair like structures on the outside of the cell
Bacterial virulence is directly proportional to disease severity:
Bacteria that can grow in low oxygen environments are known by what term?
Botulism is caused by a bacterial toxin
What is the term for bacteria staining purplish-blue with Gram-stain?
What is true about all bacteria?
They do not have mitochondria in their cytoplasm
All bacteria have a capsule
What is the term for a bacterium requiring normal atmospheric oxygen concentration to survive?
What characteristics generally apply to bacterial spores?
-They are dormant forms of the bacteria
-They may remain viable even after being autoclaved
Which type of RNA virus is influenza?
Which type of RNA virus is carried from animal to animal by mosquitoes, ticks, and lice?
In the laboratory, viruses can be grown in cell cultures.
B virus belongs to which group of viruses?
Viruses that infect animals are found in the host's cells.
In which laboratory species is the B virus found?
A typical virus is made of an envelope containing both DNA and RNA' and proteins.
Macaques that have contracted the B virus do not shed it until symptoms are observable.
Serological tests are the most common method used to identify viruses.
What group of viruses contain DNA?
Which type of RNA virus is mouse hepatitis virus?
What is TRUE about viruses?
They do not reproduce outside of a host cell.
Which decontamination method is the only way to ensure complete destruction of prions?
Because prions are very difficult to inactivate, very strict husbandry protocols are necessary to prevent their transmission.
Which species has proven to be a valuable model for encephalopathies caused by prions?
Bleach can be used to reduce the level of prion contamination on infected surfaces.
Ringworm is an example of what?