Cardiorespiratory Disease Flashcards
bTB IBR BRD
Viral causes of respiratory disease in cattle
Infectious bovine rhinotracheitis (IBR)
Malignant catarrhal fever (MCF)
PI3
RSV
BVDV
Bacterial causes of respiratory disease in cattle
Mycoplasma bovis
Mannheimia haemolytica
Pasteurella multocida
Mycobacterium tuberculosis
Contageous bovine pleuropneumonia (CBPP)
Histophilius somni (more common in North America)
Truperella pyogenes
Parasitic causes of respiratory disease in cattle
Dictocaulus viviparus (lungworm)
Management causes of respiratory disease in cattle
High stocking density
Poor ventilation
Poor colostrum
Other causes of respiratory disease in cattle
Fog fever
Caudal vena cava thrombosis
Aspiration pneumonia
Cause of IBR in cattle
Bovine Herpes Virus 1
Epidemiology of IBR
Aerosol transmission - direct or shared air spaces
Incubation period of 10-20d
Animal is infected for life once exposed
Periods of stress can cause shedding and recrudescence - calving, illness, corticosteroid use etc.
Clinical signs of mild IBR in cattle
Conjunctivitis
Epiphora
Mild strain or immunity
Clinical signs of subacute IBR in cattle
Milk drop
Pyrexia (40 degrees)
Nasal discharge
Hyperpnoea
Abortion after respiratory signs
Genital lesions
Clinical signs of acute IBR in cattle
Marked pyrexia
Secondary infection
Purulent nasal discharge
Conjunctivitis
Diagnosis of IBR in cattle
History (new animals/groups introduced) and clinical signs
Nasal and conjunctival swabs - PCR
Paired blood samples - rising titres on ALISA
Bulk milk antibody - monitor herd exposure
Control and eradication of IBR in cattle
Do nothing
Vaccination to control clinical signs - routine, conventional or marker
Accreditation/eradication (+/- vaccine)
Biosecurity - double fencing, avoid introducing new stock, test and quarantine
Accreditation schemes for IBR free herds
Accredited free
Vaccinated monitored free
Eradication programme
Live vs Inactivated vaccines against IBR in cattle
Live - rapid protection (especially intranasal), more effective?
Inactivated - reduced shedding in latently infected animals?, use if there in asymptomatic infection