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Important Avian Diseases. CVM 6882. Overview of Important Avian Diseases. Additional Important Diseases. “Liver Disease” Paramyxoviruses (Newcastle) Adenoviruses Serratospiculosis (Mid-east Falcons) Salmonella Pasteurella. Aspergillosis. Chlamydia. AgentChlamydia psittaci

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Important Avian Diseases

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Important Avian Diseases

CVM 6882


Overview of Important Avian Diseases


Additional Important Diseases

  • “Liver Disease”

  • Paramyxoviruses (Newcastle)

  • Adenoviruses

  • Serratospiculosis (Mid-east Falcons)

  • Salmonella

  • Pasteurella


Aspergillosis


Chlamydia

  • AgentChlamydia psittaci

  • Other C. trachomatis, C. pneumoniae (TWAR)

  • Character:Intracellular parasite

  • Infective form:Elementary Body (EB)

  • Reproductive:Reticulate Body (RB)

  • Infection:Aerosal, water

  • Incubation:Days to years

  • Zoonotic


Clinical Appearance: Classical Psittacosis

  • Respiratory Involvement: airsacculitis

  • Leukocytosis, heterophilia, monocytosis

  • Anemia

  • AST elevation, TP, bile acids

  • Hepatomegaly, splenomegaly\

  • Fibrinopericardititis


Avian Species Most Affected

  • Budgerigars

  • Cockatiels

  • Amazons

  • Macaws (most severely affected)

  • Love birds (endemic)

  • Pigeons

  • Not Cockatoos


Psittacosis Treatment

  • Chlortetracycline Impregnated Pellets -- 45 day treatment required

  • Oral Doxycycline

  • Injectable Doxycycline (1/w)

  • Fluoroquinolones


Diagnostic Dilemmas

  • Life Cycle of Organism

  • Stage of disease when sample is taken -- largely unknown

  • Latency -- may last for years -- no footprints

  • Variability in virulence

  • Sensitivity and Specificity of available tests


Diagnostic Tests: 2 types

  • Antigen Capture

  • Antibody Detection


Antigen Detection

  • Kodak Surecell: used on feces, limited supplies

  • Clearview -- lacks specificity, many false positives

  • PCR: increased usage (cont. Research)

  • Growth in Tissue Culture -- gold standard, cultured from tissue or feces

  • Special stains-- Gieminez


Antibody Tests

  • Non-available for in-house testing

  • Grimes Latex Agglutination (he died)

  • Modified CF Tests -- variable

  • Numerous Indirect ELISAS

  • BELISA: direct ELISA -- many false positives


Control in Breeding OperationsE.G. Commercial Cockatiels

  • Testing - PCR or culture; ( 10 - 20 pairs at end of breeding cycle or birds showing clinical signs)

  • Frequency: Year 1- every 3 months Year 2 - every 6 months Annually thereafter unless positive resultCommence with year 1 after positive result

  • Positive case - quarantine, treat, retest 4 weeks post treatment

  • Cull and treat

  • Test and quarantine any incoming birds


Avian Tuberculosis

  • Agents:M. avium, M. genovense

  • World-wide distribution

  • Chronic ganulamatous disease

  • Agent is an Acid-Fast Organism

  • Diagnosis is made by cytological examination of affected organs


TB: Clinical Appearances

  • Chronic Emaciation: Liver involvement

  • Subcutaneous Granulomas

  • Diarrhea: Intestinal Lesions

  • Dyspnea: Pulmonary Consolidation

  • Paralysis: Osseous Tubercles


Treatment and Control

  • Quarantine

  • Isolation

  • Depopulation

  • Antibiotics: not recommended

    • Isoniazid

    • Ethambutol


Trichomoniasis

  • Agents: T. gallinae, gallinarum

    • Vesogenic, mesogenic, lentogenic strains

  • Introduced from Europe

  • Commensal in Columbiformes

  • Target: oral and pharyngeal mucosa, occasionally respiratory system


Trichomoniasis Continued

  • Appearance: raised yellow-tan plaques embedded in mucosa, obliterating the choanal slite, palate or base of tongue

  • Transmission: ingestion of live flagellates

  • Clinical signs: difficult prehension, swallowing leading to debilitation


Trich: Diffs and Treatment

  • Differentials: Abscesses, foreign materials, Capillaria spp., Candida

  • Treatment

    • Metronidazole: 30 - 50 mg/kg

    • Carnidazole 10 - 100 mg/kg


Herpes Virus Infections

  • Marek’s disease - lymphoproliferative, neural disease

  • Duck plague - enteritis

  • ILT - chickens

  • Pacheco’s disease - hepatitis

  • Inclusion body hepatitis - raptors, cranes, and storks


Herpes of Falcons

  • Falconid HV-1; closely related to Columbid HV-1, the latter being the source for the former

  • Clinical:

    • Lymphopenia

    • Acute Death

    • Signs of liver disease


Pacheco’s Disease

  • Psittacid HV-1,2,3

  • South American Origin

  • Cockatoos and Amazons die peracutely

  • Macaws die acutely

  • Conures (Nanday and Patagonian) incriminated as carriers, but ……...


Management of Herpes Virus

  • No effective individual treatment although acyclovir will reduce death rate in an aviary

  • No vaccines available

  • Hygiene and Sanitation

  • Gyrfalcons and pigeons don’t mix


Pox Viruses

  • DNA Virus -- many strains

    • Falcon Pox

    • Pigeon Pox

    • Fowl Pox

    • Peacock Pox

    • Canary Pox (most pathogenic)

  • High degree of host specificity


Clinical Aspects

  • Transmitted by biting insects - virus can live in salivary gland for several weeks

  • Disease Forms:

    • Epithelial Crusts

    • Diphtheroid - Wet pox

    • Septicemic form -- Canary Pox


Treatment of Pox

  • Debride or cauterize lesions

  • Control secondary bacterial infections

  • Selective Vaccination

    • Canary

    • Chicken

    • Turkey

    • Others -- see Ritchie, Harrison, Harrison


Macaw Wasting Disease

  • Proventricular Dilatation Syndrome

  • Viral Etiology confirmed

  • Neurotropic

    • Myenteric Plexus of Mid g.I. Tract

    • Crop

    • Other neural tissue


Macaw Wasting

  • Species: all psittacines, contagious

  • Signs may not appear for several months after exposure

  • Signs: slowing g.I. Tract, undigested seeds in stool, cachexia,, dehydration, death

  • No treatment, no vaccination

  • Aviaries: depopulate


Paramyxoviruses: Newcastle (VVND)

  • Newcastle: PMV-1

  • PMV2-9: PMV-3 causes mild neurologic signs in pigeons Clinical

  • Signs:

    • Diarrhea, respiratory signs followed by neurologic signs (torticollis)


Budgerigar Fledgling Disease:Polyoma Virus

  • Highly infectious, stable

  • Causes

    • Budgerigar Fledgling Disease: peracute death with near 100% mortality in birds < 15d

    • French Molt: feather dystrophy syndrome

    • Polyserositis in other psittacines with bleeding syndromes


Other BFD (Polyoma)


Other Polyoma


Polyoma (cont)

  • Diagnosis:

    • Feather lesions indistinguishable from BFD

    • Antemortem: Cloacal swab and culture

    • Postmortem: DNA probes

  • Control

    • Isolation of shedders away from neonates

    • Control feather dust and other hygiene

    • Vaccinate -- killed vaccine available


Beak and Feather Disease

  • Circovirus Disease

  • Septicemia and peracute death in nestlings

  • Beak Necrosis,Feather Dystrophies, worsening with each successive molt

  • Endemic in wild cockatoos (Australia)

  • Also will infect New World Parrots


Beak and Feather


Beak and Feather (cont)

  • Diagnosis: Signs, biopsy, DNA Probes

  • No treatment, no vaccination

  • No spontaneous recovery; affected birds die from secondary problems


Infectious

G- Bacteria

Chlamydia

Mycobacteria

Viruses:

Herpes

Adeno

Polyoma

Reovirus

Trematodes (esp. cockatoos)

Non-Infectious

Aflatoxicosis

Fatty Liver

Iron Storage Disease

Neoplasia

Protozoal

Toxoplasma

Trichomonas

Histomonas

“Liver Disease”: Causes


Physical and chemical

Elevated AST, CK, Bile Acids

G. I. Stasis

Feather abnormalities

Chronically overgrown beak and claws

Hepatic Encephalopathy

Clinical

Weight loss

Weakness

Ascites

Biliverdinuria

Melena

Coagulopathy

Liver Disease Signs:


Liver Disease Signs


Liver Disease Treatment

  • Fluids

  • Hyperalimentation

  • Lactulose

  • Antibiotics

    • Doxycycline

    • Enrofloxacine

    • Metronidazole or Clindamycin

  • Other Specific Chemotherapy as indicated


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