MSD Manual

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Outcome After Infections of Chickens With Wild-Type or Embryo-Adapted Avian Encephalomyelitis Virus

Outcome After Infections of Chickens With Wild-Type or Embryo-Adapted Avian Encephalomyelitis Virus

Infection Route

Age of Bird

Wild-Type Virus

Embryo-Adapted Virus

In ovo/vertical

Embryo

No lesions

Paralyzed

Vertical

< 4 weeks

Neurologic signs

Will not hatch

Oral

< 4 weeks

Neurologic signs

No signs

4 weeks to onset of lay

No signs

No signs

In lay

Decrease in egg production

No signs

Any age, bursectomized or immunocompromised

Neurologic signs

No signs

Intradermal (wing web)

< 4 weeks

No signs

Neurologic signs

4 weeks to onset of lay

No signs

Neurologic signs

In lay

Decrease in egg production

Neurologic signs

Any age, bursectomized or immunocompromised

Neurologic signs

Neurologic signs

Intramuscular

Any age

Neurologic signs

Neurologic signs