Poulvac® Laryngo A20

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  • A freeze dried modified live viral vaccine. Each dose contains infectious laryngotracheitis virus (A20 strain; ≥ 103.5 pfu)

  • For the prevention of infectious laryngotracheitis in poultry.

  • Glass vials – 2,000ds each

    Packed in tray of 10 (20,000ds total)

  • Use all the contents of the product vial within 2 hours of opening

    Poulvac Laryngo A20 is recommended at 7 days of age to provide early protection against ILT infection. 

    Broiler birds held beyond 7 weeks of age may need to be revaccinated. 

    Eye Drop Method

    Reconstitution Reconstitute the vaccine with Poulvac® Eye Drop Diluent. Poulvac® Eye Drop Diluent is supplied in a plastic bottle which becomes the dropper bottle when the provided dropper cap is fitted.

    Hold the bird with the eye upward and apply 1 drop (0.03 mL) to the eye. Make sure the drop of vaccine spreads over the eye before releasing the bird. It is an important part of successful technique to hold the bird in such a way that the droplet covers the eye surface and does not run off.

    Drinking Water Method


    Whenever available clean water containing 2.5 grams of instant skim milk powder per litre should be used as a diluent for reconstitution.

    The vaccine should be prepared immediately before use by tearing the cap off the vial, removing the rubber stopper and resuspending the virus with pre-chilled diluent. After shaking, the reconstituted vaccine is poured into the 3-5 litres of skim milk solution (2.5 grams of instant skim milk per litre of chilled water). 

    Vaccination delivery may be via drinking water lines or direct dispensing to drinkers.

    Early morning administration is recommended. 

    See pack instruction sheet for detailed notes on application and administration.

  • Research has shown that ILTV vaccine viruses can recombine to potentially form more virulent strains of ILTV. To minimise the possibility of this happening, ILTV vaccines originating from genetically distinct ILTV strains should not be used concurrently in a flock or on a site. It is essential that all birds within a flock vaccinated against ILTV each receive an effective immunising dose to ensure that there are no naive susceptible birds remaining in the flock.

  • Simultaneous administration of Poulvac Laryngo A20 and Infectious Bronchitis vaccines is not recommended.

    Only birds in good health should be vaccinated. The presence of either concurrent infections (e.g. mycoplasmosis, coryza) or husbandry stress

    factors may cause a reaction.

    The use of disinfectants or antiseptics in or on any equipment used for the preparation of Poulvac Laryngo A20 must be avoided.

    Sanitising chemicals in the farm water supply should not be used for 3 days prior to vaccination with Poulvac Laryngo A20.

    All birds must receive the full dose of living vaccine to be fully protected.

  • Storage:
    Store below -5oC (freeze.)

    Protect from light.

    Withholding period:
    Zero (0) days




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