Chapter 13: Agents of Disease (Bacteria and virus) Flashcards
Gram-positive
large external cell wall, PURPLISH-BLUE
Gram-negative
Think internal cell wall, PINK
Cocci
round or spherical shape
coccobacilli
ovoid shape
bacilli
rod-like shape
spiral
shaped with a twist: such as as: vibrio (curved), spirillum (helical and rigid), spirochete (helical and flexible)
virulence
degree of pathogenicity of a microorganism
C tetani
cause tetnus
C. botulinum
toxin that cause of botulism
C. difficile
flourishes in rodent and rabbits when severe upset of the normal bacterial flora occurs in the GI tract,
causes severe enteritis
C. piliforme
may have a role in enteritis (Tyzzer’s disease)
aerobic bacteria
Stpaphylococcus aureus, grow in the presence of normal atmospheric oxygen concentration
microaerophilic
bacteria that achieves maximal growth in the presence of only traces of oxygen (3% to 6% O2)
Anaerobic
bacteria grow in the absence of oxygen
facultative anaerobes
many common in intestinal bacteria. they can live with or without oxygen
the 3 most common disease-causing DNA virus families are
poxviruses
parvoviruses
herpesviruses
examples of poxviruses
smallpox and vaccinia in humans, mouse pox in mice, monkey pox in NHP and orf in small ruminants
what kinds of diseases do poxviruses cause
many skin disease and other more severe disease in humans, sheep, goats and various rodents and bird species
what species for parvoviruses infect
humans, mice, cats, and dogs
Clinical sign of a parvovirus in dogs
GI problems
Clinical sign of a parvovirus in cats
brain malformation in neonatal
Clinical sign of a parvovirus in NHP
anemia
Clinical sign of a parvovirus in Rats
Scrotal hemorrhage
Clinical sign of a parvovirus in Mice
MVM minute virus of mice, causes a highly contagious infection of the T and B cells