Gallid Herpesvirus 1
Class DNA Viruses
Order Caudovirales
Family Herpesviridae
Genus Infectious Laryngotracheitis-like Viruses
Species GHV-1
Also Known As:
Infectious Laryngotracheitis —
ILT —
AILT —
Laryngotracheitis Virus —
LTV
Caused By:
Gallid Herpesvirus I also known as:
GHV-1 — Infectious Laryngotracheitis Virus — ILTV — LTV
Introduction
Gallid Herpes virus causes
respiratory disease in
chickens and pheasants.
Disease varies from mild to peracute, with mortality in peracute outbreaks exceeding 50%.
As with all herpesviruses, GHV-1 can remain
latent in carriers after infection and then be shed intermittently,
recrudescing with stress.
Signalment
The chicken is the primary host and reservoir host. A form of LT has been described in pheasants.
Distribution
Worldwide. Transmission is via
direct contact and contaminated people and equipment. Vermin and wild birds and dogs may aid mechanical transmission.
Clinical Signs
Respiratory signs:
Nasal discharge which is often
bloody
Coughing which may also include blood
Sneezing, dyspnoea,
gasping, upper respiratory tract pain
Abnormal lung sounds
Decreased egg production, thin egg shells, lack of growth
Neurological and ophthalmologic signs may develop.
Death may occur rapidly and with
high mortality in peracute and acute disease. In recent times, LT usually presents in a mild form and most birds recover.
Diagnosis
On
post-mortem, haemorrhagic tracheitis and bloodstained mucus are evident. Pneumonia and sacculitis may also be seen.
Caseous diptheritic membranes may be present on the mucosae of the upper respiratory tract.
Histopathology reveals loss of cilia, mucosal gland atrophy, intranuclear inclusion bodies and epithelial cell sloughing. Characteristic syncytia develop. A fibrinonecrotic membrane may be present in more chronic disease cases.
Antigen ELISA is both straightforward, quick and sensitive. The PCR can be used to detect LTV.
Immunofluorescent or Immunoperoxidase staining can also be performed and is more rapid but less sensitive.
Virus isolation on a variety of tissues including tracheal swabs or tissue samples may be useful.
Agar Gel
Immunodiffusion can detect virus in tracheal samples.
Electron microscopy can be used to demonstrate viral particles in tracheal scrapings or exudates but is insensitive.
Measuring viral antibody measures infection indirectly as serum antibodies peak around 2 weeks after infection and wane slowly afterwards.
Treatment
Where early diagnosis is made,
vaccination can be administered
in the face of infection to help reduce further morbidity and mortality.
Control
ILT can be effectively controlled by
vaccination. Vaccinated and unvaccinated birds should
not be mixed due to the
possibility of reversion to virulence. Most are modified live isolates and are administered by
eye drop.
Adequate biosecurity, quarantine and disinfection is also essential.
Wild birds and vermin should be prevented from accessing poultry and their food/water sources.
Looking for an avian vet again the one who came out said to look this up but gave no meds and No Perscriotion and they would get well on their own ,,I do not believe this any advice i have worked hard keeping my flock up and healthy this vet charged me 500 for the tests on 16 birds i have babies but now i think those day olds will be well sick too please advise Please begging in tears and crying wondering is this contagous to humans and other animals what about my parrot ?
OMG Tammy, so very sorry for your issues, I know how hard you worked to get those darks, I hope things work out so you don't loose too much, poor babies