GI Infections Pathogens Flashcards
What is normal flora
beneficial/good bacteria ]not all colonisation is normal
begins at birth
What traits increase an invading organisms chance of success
High growth rates
Dispersal capability
Phenotype plasticity
Genetic diversity
Stages of invasion
Introduction -to a new environment/community
establishment-and maintenance of a viable invader
growth and spread-upon the acquisition of resources
impact - of varying consequences
Where are new pathogens colonised
In the tissue under the epithelial cells
What does colonisation mean
The establishment of a microorganism within or on a host - may be short lived
What is a pathogen
Any microorganism the potential to cause disease
What happens in the incubation period
Pathogen replicates in host
What immune system components target bacteria
Phagocytes
Antibodys and B lymphocytes
Complement proteins
What immune system components target viruses
T lymphocytes
antibodies and B lymphocytes
What immune system components target fungus
Eosinophils
T lymphocytes
Phagocytes
What immune system components target protozoa
T lymphocytes
Eosinophils
What immune system components target worms
Eosinophils
Mast cells
What colour to gram +ve bacteria stain and why
PURPLE
peptidoglycan wall traps crystal violet dye
What colour do gram -ve cells stain and why
PINK
no peptidoglycan wall to trap crystal violet dye so it is easily washed away
What are enterobacteriaceaec
Gram negative rods
Non spore forming
Ferment sugars
