Bacillus!!! MICROM 442 Deck 12 Flashcards
1
Q
Bacillus cereus are long-wide GM???
A
positive rods but decolorize to appear GNR
2
Q
widely distributed in nature based on its characteristics of?
A
aerobe; beta-hemolytic; motile; spore former.
3
Q
Spore formation
A
- heat and dessication resistant
- metabolically inactive
- withstand autoclaving
- germinate into cells after decades of persistence
4
Q
Enterotoxins are both
A
heat-stable and heat-labile
5
Q
heat-stable, acid-tolerant, proteolysis-resistant toxin;
emetic illness, i.e., vomiting
A
circular peptide, cereulide, with ionophore activity
6
Q
heat-labile toxins; associated diarrheal illness
A
- tripartite enterotoxins
- sequentially assemble on surface of cell
- mechanism of toxicity unknown
7
Q
Gastrointestinal infections
A
found in up to 25% of food
tested; rice is common vehicle for illness
8
Q
emetic form, i.e., vomiting, with nausea and abdominal
cramping
A
- toxin contamination of food
- 2-3 hr incubation
9
Q
diarrheal form
A
- intestinal bacterial replication;
mechanisms of toxicity unclear - 6-24 hr incubation
- diarrhea, cramps; fever is not common
10
Q
how are cultured bacteria identified?
A
by morphology
