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Shannon Martinson http://people.upei.ca/smartinson/
Pathology of the Respiratory System 4: Lung – Pneumonia
Shannon Martinson, Jan 2017
http://people.upei.ca/smartinson/ VPM 222 Systemic Pathology
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Congenital
Pigmentary deposition
Circulatory Disturbances
Inflation disturbances
Pneumonia
Neoplasia
DISORDERS OF THE LUNG
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LUNG – PNEUMONIA
Diffuse
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LUNG – PNEUMONIA
Diffuse
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Examples of Diseases that Cause Bronchopneumonia in Domestic Animals
LUNG – PNEUMONIA
Fibrinous Bronchopneumonia Suppurative Bronchopneumonia
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LUNG – BRONCHOPNEUMONIA - CATTLE
Multifactorial Etiology:
• Environmental factors*
• Crowding, humidity, temperature, air quality, stress
• Viral infection*:
• BRSV
• BPIV-3
• BoHV-1 (IBR)
• Bacterial infection
• Pasteurella multocida*
• Histophilus somni*
• Mycoplasma bovis
• Trueperella pyogenes
• Mannheimia hemolytica
High morbidity / Low mortality
Enzootic Pneumonia of Calves
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LUNG – BRONCHOPNEUMONIA - CATTLE
• Suppurative bronchopneumonia • Should do bacteriologic culture and virologic testing!
Enzootic Pneumonia of Calves
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LUNG – BRONCHOPNEUMONIA - CATTLE
Shipping Fever (Pneumonic Mannheimiosis)
• Part of the normal URT flora
• Impairment of pulmonary defence mechanisms:
• Environmental factors / stress
• Transit, crowding
• Viral infections: (BRSV, BPIV-3, BoHV-1)
Fibrinous bronchopneumonia
Etiology: Mannheimia hemolytica
Low morbidity / High mortality Bacteria produce leukotoxins → sepsis and death
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Shipping Fever (Pneumonic Mannheimiosis)
LUNG – BRONCHOPNEUMONIA - CATTLE
Coagulative necrosis
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LUNG – BRONCHOPNEUMONIA - CATTLE
Shipping Fever (Pneumonic Mannheimiosis)
Other bacteria causing similar lesions:
• Histophilus somni*
• Mycoplasma mycoides ssp. mycoides small colony type
• Contagious bovine pleuropneumonia – exotic / reportable disease
• Often affects the caudal lobes and sequestra are common
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LUNG – BRONCHOPNEUMONIA - CATTLE
• Necrosuppurative bronchopneumonia and bronchiectasis (=dilation and destruction of bronchioles )
Gross images: Dr E Aburto
Lung abscesses
Etiology: Mycoplasma bovis
• Difficult to differentiate grossly from abscesses
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LUNG – BRONCHOPNEUMONIA - CATTLE
Gross images: Dr E Aburto
Doesn’t grow on routine culture: • Mycoplasma specific culture,
Histology + IHC, PCR
Etiology: Mycoplasma bovis
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LUNG – BRONCHOPNEUMONIA - SHEEP
Ovine Enzootic Pneumonia
Multifactorial Etiology:
• Environmental factors
• Crowding, humidity, temperature, air quality, stress
• Viral infection:
• RSV
• BPIV-3
• Adenovirus
• Bacterial infection
• Mannheimia hemolytica
• Pasteurella multocida
• Mycoplasma ovipneumonia
• Histophilus somni
• Suppurative bronchopneumonia
• Should do bacteriologic culture and virologic testing!
High morbidity / Low mortality
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LUNG – BRONCHOPNEUMONIA - SHEEP
Pneumonic Mannheimiosis
• Etiology:
• Mannheimia hemolytica
• Predisposing factors: Viral infection, Stress
• Septicemic Pasteurellosis
• Etiology:
• Bibersteinia trehalosi
• Sepsis
• Oral / esophageal ulcers
Fibrinous bronchopneumonia
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LUNG – BRONCHOPNEUMONIA - PIG
• Often secondary to impairment of pulmonary defence mechanisms:
• Environmental factors
• Crowding ammonia, temperature, stress
High morbidity / Low mortality
Porcine Enzootic Pneumonia Etiology: Mycoplasma hyopneumonia
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LUNG – BRONCHOPNEUMONIA - PIG
Porcine Enzootic Pneumonia
Suppurative bronchopneumonia
• Histology • IHC • PCR P. multocida is often isolated in suppurative bronchopneumonia of pigs
Etiology: Mycoplasma hyopneumonia
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Etiology: Actinobacillus pleuropneumonia (APP)
High mortality in naïve herds
LUNG – BRONCHOPNEUMONIA - PIG
Porcine Pleuropneumonia
• Highly contagious
• 2-5 month old pigs
• Sudden death with blood tinged froth from the nares
• Dyspnea and coughing
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Etiology: Actinobacillus pleuropneumonia (APP)
LUNG – BRONCHOPNEUMONIA - PIG
Porcine Pleuropneumonia
Images: Cornell Veterinary Medicine
Fibrinous bronchopneumonia • Often dorsocaudal in distribution
• Coagulative necrosis • Sepsis / Shock • Sequestra
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LUNG – BRONCHOPNEUMONIA – DOGS AND CATS
• Most often secondary* • Common bacterial isolates:
• Pasteurella multocida • Streptococcus spp • Escherichia coli • Klebsiella pneumoniae • Bordetella bronchiseptica
• Cats • Streptococcus equi zooepidemicus
• Fatal hemorrhagic pneumonia in dogs
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LUNG – BRONCHOPNEUMONIA – ALL SPECIES
Aspiration Pneumonia
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LUNG – BRONCHOPNEUMONIA – ALL SPECIES
Dog
• Secondary to vomiting
Aspiration Pneumonia
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LUNG – BRONCHOPNEUMONIA – ALL SPECIES
• Secondary to administering a “milk shake” Horse
Aspiration Pneumonia
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LUNG – BRONCHOPNEUMONIA – ALL SPECIES
Aspiration Pneumonia
Cat
• Secondary to anesthesia
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Examples of Diseases that Cause Interstitial Pneumonia in Domestic Animals
LUNG – INTERSTITIAL PNEUMONIA
Rib Imprints and Elastic Texture
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Etiology:
• Bovine parainfluenza virus 3
• Bovine respiratory syncytial virus
• Bovine herpesvirus 1
• Disease name: Infectious Bovine Rhinotracheitis
LUNG – INTERSTITIAL PNEUMONIA - CATTLE
Viral pneumonia
• Virologic testing • PCR • FAT • IHC
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LUNG – INTERSTITIAL PNEUMONIA - CATTLE
Atypical Interstitial Pneumonia
• Bovine Pulmonary Edema and Emphysema
• Extrinsic Allergic Alveolitis
• Reinfection Syndrome
• Inhalation of gases (H2S or NO2)
• BRSV • Dictyocaulus viviparous
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Tryptophan
Tryptophan 3-methyl indole (3-MI) in rumen
3-methyl indole (3-MI) in blood to Club cells
Pathogenesis
LUNG – INTERSTITIAL PNEUMONIA - CATTLE
Atypical Interstitial Pneumonia - Bovine Pulmonary Edema and Emphysema (BPEE)
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LUNG – INTERSTITIAL PNEUMONIA - CATTLE
Atypical Interstitial Pneumonia - Bovine Pulmonary Edema and Emphysema (BPEE)
Edema and Emphysema
Interstitial pneumonia
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LUNG – INTERSTITIAL PNEUMONIA - HORSES
Etiology: Equine influenza virus
Etiology: Equine herpesvirus 4* and 1
• Transient respiratory disease • High morbidity and low mortality
• Transient respiratory disease • Also neurologic disease and abortion (EHV-1)
Equine Viral Rhinopneumonitis
• Virologic testing • PCR • FAT • IHC
Other viral diseases of the lung
• Equine herpesvirus 5
• Equine viral arteritis
• African horse sickness
• Hendra virus
Equine influenza
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LUNG – INTERSTITIAL PNEUMONIA - PIGS
Swine influenza
Etiology: Swine influenza virus
Etiology: PRRS virus
• High morbidity and low mortality • Transient respiratory disease • Predispose to bacterial pneumonia
Porcine Reproductive and Respiratory Syndrome
Etiology: Porcine circovirus type 2 (PCV-2)
PCV-2 Associated Respiratory Disease
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LUNG – INTERSTITIAL PNEUMONIA - PIGS
• Virologic testing • PCR • FAT • IHC
Swine influenza, PPRS, PCV2AD
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LUNG – INTERSTITIAL PNEUMONIA - PIGS
Other causes of interstitial pneumonia in pigs: • Nipah virus • Sepsis
• Salmonella spp. • Ascaris suum migration
• Hypersensitivity
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LUNG – INTERSTITIAL PNEUMONIA – DOGS AND CATS
• Canine Distemper (Morbillivirus)
• Canine Parainfluenza
• Canine Adenovirus 2
• Canine Influenza
• Feline rhinotracheitis (FeHV-1)
• Feline Calicivirus
Dogs
Cats
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LUNG – INTERSTITIAL PNEUMONIA – SMALL RUMINANTS
Ovine Progressive Pneumonia (Visna-Maedi)
(Lymphoid Interstitial Pneumonia)
• Affects sheep
• Gross Findings
• Heavy pale lung
• Elastic texture
• Emaciation
• Histology:
• Lymphocytes in interstitium and
hyperplastic BALT
Etiology: Visna Maedi virus (Retrovirus)
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LUNG – INTERSTITIAL PNEUMONIA – SMALL RUMINANTS
Caprine Arthritis and Encephalitis (CAE)
• Affects goats
• Gross Findings
• Heavy pale lung with elastic texture
• Emaciation, +/- arthritis, encephalitis
• Histology:
• Lymphocytes in interstitium, hyperplastic
BALT, proteinaceous fluid in alveoli
Etiology: CAE virus (Retrovirus)
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Examples of Diseases that Cause Granulomatous Pneumonia in Domestic Animals
LUNG – PNEUMONIA
Granulomas / Nodular texture
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LUNG –GRANULOMATOUS PNEUMONIA – ALL SPP
Tuberculosis Etiology: Mycobacterium bovis
Mycobacterium tuberculosis
• Important in many species: • Humans, ruminants, pig, horses • Wildlife reservoirs
• Chronic wasting • Granulomas
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LUNG –GRANULOMATOUS PNEUMONIA – ALL SPP
Tuberculosis Etiology: Mycobacterium bovis
Mycobacterium tuberculosis
• Multisystemic lesions • Granulomatous lymphadenitis • Granulomatous pneumonia
• Spread via aerosol • Granulomas with acid-fast bacilli
PCR / special culture to confirm diagnosis
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