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

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Information that is clear and easy to understand on thousands of medical disorders and symptoms

Learn about SectionName symptoms, diagnosis and treatment in the MSD Manual. HCP and Vet versions too!

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