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PA Microbiology 1 Matching
What role does Lipid A play in the function of LPS endotoxin?
Lipid A is the virulence factor... elicits a toxic response from the immune system= it is the endotoxin
What is the difference between opportunistic and virulent pathogens?
Opportunistic pathogens can be a part of normal flora, & do not produce disease in their normal habitat. Also if the patient's defenses are down: trauma, defective immune system, preexisting condition. Virulent pathogens are always associated with diseas
Which Cholerae serogroup (O antigen) is the cause of classic epidemic cholera?
O-1
What is the gram type, motility, and dose and oxygen requirements of Clostridium perfringens?
G+, non-motile, high dose organism, aerotolerant anaerobe, ***Forms spores
Name 2 examples of virulent bacteria and their gram type.
1. Mycobacterium tuberculosis (acid fast) 2. Neisseria gonorrheae (G-)
What are two factors that facilitate the concept of tissue tropism?
1. Growth factors availability varies depending on habitat/tissue type 2. Receptor sites for microbe attachment vary depending on habitat/tissue type
What color does a G- bacteria stain, and what is the reason for this?
Pink/Red...thin peptidoglycan layer of cell wall does not retain Crystal Violet stain, but retains Safranin stain
What is a preventative method for B. cereus transmission?
Refrigerate grains quickly after cooking
What Cell Envelope structural feature is unique to Acid-Fast bacteria?
Mycolic Acid layer (outermost layer)
What is the gram type, shape, oxygen requirements of C. difficile?
G+, rod-shaped, anaerobic **Forms spores
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