Bacteriology - Pyogranulomas Flashcards
(56 cards)
What type of cells will be seen in acute inflammation?
neutrophils
Pyogenic bacteria causes suppurative inflammation primarily acting as __________
extracellular bacteria
Underlying disease process is usually of one ________ and ________
suppuration and abscess formation
What are the 4 main types of pyogenic bacteria?
staphylococci
streptococci
cornyebacteria
trueperella
Which bacteria are a mixture of acute and chronic inflammation?
pyogranulomatous
How do pyogranulomatus cause inflammation?
by acting both extra and intracellularly
How can pyogranulomatus avoid being killed?
evading intracellular destruction
How can we overcome bacteria evading intracellular destruction?
through cell mediated immunity which can be achieved by vaccines
What are the rules of thumb regarding Gram positive rods
less frequent isolated than other groups of bacteria
tend to cause syndromes - can give presumptive diagnosis
if more information is needed definitive diagnosis is needed
What are the 3 main types of actinomycetes?
actinomycetes
nocardia
dermatophilus
What is an important diptheroid gram positive bacteria?
rhodococcus
What are the oxygen requirements of
Actinomycetes
Nocardia
Dermatophilus
A - FA or ANO2
N - strict aerobes
D - strict aerobes
What are the 3 main characteristics of pyogranulomatous
gram +
filamentous
branching rods
What are distinguishing features of rhodococcus?
gram +, short club shaped rods
What is meant by actinomyces being an opportunistic disease?
requires something to allow access of organism into diseased sit and disease is NEAR where they are normal flora
Most species of actinomyces are normal flora of what two areas?
oral cavity and GIT
Which Actinomycetes is considered to be a saprophyte? What does this mean?
Saprophytes
found in soil and decaying vegetation
While nocardia is considered to be opportunistic, it is considered to be a ______ pathogen. What does this mean?
poor
requires significant compromise
Which Actinomycete is considered to be an obligate parasite of the skin but can survive in the environment for a long time
dermatophilus congolensis?
Who is considered to be a reservoir to dermatophilus congolensis?
carrier animals or fomites
Which Actinomycete requires alteration of the skin for invasion, typically wetting?
Dermatophilus congolensis
How can dermatophilus be transferred from an infected/carrier animal to a susceptible one?
rub against each other (contagious)
transferred by insects (flies, ticks)
by contaminated fomites (scabs, sheep dips, brushes)
Where do Rhodococci equi come from?
saprophytes
found in soil
secondary in GIT of horses
animal manure
inhalation or ingestion
What are the virulence factors of nocardia?
mycolic acid and cell wall lipids
