Microbiology Flashcards
What colour does gram +ve bacteria stain
purple
What colour does gram -ve bacteria stain
pink
What is pathogenicity?
ability of a microorganism to produce disease
What is virulence?
The degree of pathogenicity of an organism
What atmosphere is microaerophilic?
Decreased oxygen and increase carbon dioxide
Where are exotoxins produced?
Inside the cell then exported out (gram +ve)
Where are endotoxins located
The gram -ve cell wall
Streptococci: (3 facts)
Grow best aerobically
Are gram +ve cocci in chains
Can be differentiated by the type of haemolysis seen on blood agar
Streptococci (alpha haemolytic) examples
Strep. pneumoniae + strep. viridians
Streptococci (beta haemolytic) examples
Group A and group B strep
Streptococci (non-haemolytic) examples
Enterococci group
Staphylococcus: (3 facts)
Aerobic
Gram +ve cocci in clusters
Coagulase test used to determine Staph. aureus from other Staph.
Give an example of a group of Gram -ve cocci
Neisseria (appear in pairs)
Coliforms: (3 facts)
Aerobic
Gram -ve E.coli-like bacteria
Differentiated from one anotehr by biochemical reactions and antigenic structure
Name 3 other types of gram -ve bacilli and example(s) of each
Strict anaerobes:
Pseudomonas aeruginosa
Legionella pneumophila
Spiral/curved:
Vibrio cholaerae
Campylobacter spp.
Helicobacter pylori
Coccobacillus:
Haemophilus influenzae
