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Anthrax [Bacillus anthracis] - Coggle Diagram
Anthrax [
Bacillus anthracis
]
Diagnosis
Clinical signs
:cow2:
Blood from orifice
Non-clotting
Absence of rigor mortis
Sudden death - lethal factor
Low spore count needed
History
Anthrax on property
Anthrax belt location
:pig2: :cat2: :dog2:
Septicaemia
High spore count needed
Local oedema - Oedema factor
Pharyngeal region
Local lymph drainage
Dysphagia; asphyxiation
Intestinal form
Enteritis + mesenteric lymphadenitis
Upper GIT necrosis
:horse: :goat:
Localised oedema
Enteritis (diarrhoea) + colic
<susceptible than :cow2:
Anthrax Immunochromatographic Test (ICT)
Blood sample
Dead animal <48hr
100% sesitivity
Gram and capsule stain
Encapsulated G+ve rods
Ear sample
Pathology lab
Culture
Localised fluid
Lymph nodes
Pathogenesis
Virulence factors "Obligate pathogen"
Capsule
Phagocytosis resistance
Ab non-protective
Toxin
Protective Ag
Intracellular invasion
Oedema factor
Adenylate cyclase
Extracellular Fluid + electrolyte release
Lethal factor
Hyper-responsive macrophages
IL-1, TNF, IL-6
Inflammatory cascade
Causes death
Transmission
Spore ingestion
Breaks in epithelium
Invade mucous membranes
Excretions seed area
Scratches or wounds; inhalation
Insect vector transmission :butterfly:
Treatment / control
Carcass disposal (AustVet Plan)
Incineration :fire:
Bury deeply
Away from :potable_water: sources
Formaldehyde
Notifiable Disease
Biosecurity
Isolation
Disinfecting
Chemical disinfectants
Sustained High concentrations
Boiling, prolonged dry heat
Vaccination of livestock :syringe:
3 years after diagnosis
Moderate protection
Cost prohibitive - requires authorisation :money_with_wings:
Rapid antibiotic administration
Penicillin - beta lactam
Other antibiotics effective
Fluoroquinolones, tetracyclines, streptomycin, erythromycin
10d prior to vaccination
Permanent immunity after recovery
Protective Ab against toxins
:red_cross: internalisation /activation of Oedema + Lethal Factor
Characteristics
Environmental resilience
Spore germination
Aerobic conditions
High temperature :fire: ; moist conditions
Heavy rain :droplet: following drought
Lack of other soil-living bacteria
Source
Animal / animal products
Carcass disposal
Soil (alkaline)
"Anthrax Belt" - NSW and VIC
Flooding, excavation, earthworms
High zoonotic risk
Cutaneous form "Malignant Carbuncle"
Only form observed in Aus
Pulmonary form "Woolsorter Disease"
Intestinal form
Haemorrhagic enteritis