Bacillus Flashcards
habitat
widely distributed - animals, enviro, soil
morphology
medium rod, central spore, capsule, flagella
which bacillus species has no flagella
anthracis
staining
Gr+, toluidine blue, pink capsule around bact
culture
simple
colony morphology
R-S, needs CO2 to form capsule so more CO2 S type
virulence factor
poly D glutamic acid capsule - inhibits phagocytosis
whats needed for spore formation
- 15 degrees
- water
- oxygen
- cations
why shouldnt we open the carcass if we suspect anthrax
because if we allow oxygen in well be allowing spore formation
how long acn endospore survive
decades, over 50 years
catalase
pos
oxidase
neg
antigens
- capasule
- polysaccharide hapten
- oedema factor
- lethal factor
- protective antigen
resistance of vegetative bacterium in carcass
several days
resistance of vegetative bacterium in skin
2wks
resistance of vegetative bacterium in bone marrow
4wks
resistance at 56 degrees
15mins - cannot tolerate high temp
spore resistance boiling
5-10min
spore resistance formaline
12-24hrs
pathogenicity cattle, sheep
fatal peracute or acute septicaemic anthrax
pathogenicity swine
subacute anthrax with oedematous swelling in pharyngeal region
pathogenicity horses
subacute anthrax with localised oedema, septicaemia with colic and enteritis
humans pathogenicity
skin, pulmonary and intestinal forms
carnivores pathogenicity
comparitively resistant - only if they eat raw infected meat
