Leucogen Suspension for Injection for Cats
Active ingredient: Feline leukemia virus
Form
Injection
Species
Manufacturer
VIRBAC
VMD MA No.
05653/5014
What it's used for
Active immunisation of cats from eight weeks of age against feline leukaemia for the prevention of persistent viraemia and clinical signs of the related di...
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Prescription required
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Leucogen Suspension for Injection for Cats — SPC Details
Source: VMD Summary of Product Characteristics (SPC). Last updated 26 Mar 2026.
prevention of persistent viraemia and clinical signs of the related disease.
The onset of immunity has been demonstrated from 3 weeks after the primary
vaccination.
After the primary vaccination course, the duration of immunity lasts for one year.
Following a first booster vaccination one year after the primary vaccination course, a
duration of immunity of 3 years has been demonstrated.
Shake the vial gently and administer subcutaneously one dose (1 ml) of the
veterinary medicinal product according to the following regimen of vaccination.
Primary vaccination:
- first injection in kittens from eight weeks of age
- second injection 3 or 4 weeks later.
Maternally derived antibodies can negatively influence the immune response to
vaccination. In such cases where maternally derived antibodies are expected, a third
injection may be appropriate from 15 weeks of age.
Re-vaccinations:
Following a first booster vaccination one year after the primary vaccination course,
subsequent vaccinations can be performed at intervals of three years.
Issued: September 2023
AN: 00161/2023
injection. This local reaction could be a swelling, an oedema or a nodule and
resolves spontaneously within from 3 to 4 weeks at the most. After the second
injection, and subsequent administrations, this reaction is markedly reduced.
The transient signs following vaccination such as hyperthermia (lasting 1 to 4 days),
apathy and digestive disturbances (such as emesis and diarrhoea) may also be
commonly observed.
Pain at palpation, sneezing or conjunctivitis may be noted in rare cases. This
resolves without any treatment.
Anaphylactic reactions have been reported in very rare cases. In case of
anaphylactic shock, appropriate symptomatic treatment should be administered.
The frequency of adverse reactions is defined using the following convention:
- very common (more than 1 in 10 animals treated displaying adverse reactions)
- common (more than 1 but less than 10 animals in 100 animals treated)
- uncommon (more than 1 but less than 10 animals in 1,000 animals treated)
- rare (more than 1 but less than 10 animals in 10,000 animals treated)
- very rare (less than 1 animal in 10,000 animals treated, including isolated reports).
Special precautions for use in animals
De-worming at least 10 days prior to vaccination is recommended.
Only feline leukaemia virus (FeLV) negative cats should be vaccinated. Therefore, a
test for presence of FeLV before vaccination is recommended.
Special precautions to be taken by the person administering the veterinary medicinal
product to animals
In case of accidental self-injection, seek medical advice immediately and show the
package leaflet or the label to the physician.
mixed and administered with FELIGEN CRP or FELIGEN RCP. No information is
available on the safety and efficacy of this vaccine when used with any other
veterinary medicinal product except the products mentioned above. A decision to use
this vaccine before or after another veterinary medicinal product therefore needs to
be made on a case by case basis.
Issued: September 2023
AN: 00161/2023
Do not freeze.
Protect from light.
5. IMMUNOLOGICAL PROPERTIES
Pharmacotherapeutic group: immunologicals for Felidae, inactivated viral vaccines
for cats.
ATCvet code: QI06AA01.
Vaccine against feline leukaemia.
The vaccine contains the purified p45 FeLV-envelope antigen, obtained by genetic
recombination of the E. coli strain. The antigenic suspension is adjuvanted with an
aluminium hydroxide gel and with a purified extract of Quillaja saponaria.
Protection against persistent viraemia is observed in 73% of cats 3 weeks after their
first vaccine injection.
This information is sourced from the official Summary of Product Characteristics (SPC) published by the Veterinary Medicines Directorate (VMD). It is provided for informational purposes only and does not replace professional veterinary advice. Always consult your vet before administering any medication.
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Other Products Containing Feline leukemia virus
These products share the same active ingredient and may be suitable alternatives. Always consult your vet.
Leucofeligen FeLV/RCP Lyophilisate and Solvent for Suspension for Injection for Cats
POM-VVirbac
Leucofeligen FeLV/RCP Lyophilisate and Solvent for Suspension for Injection for Cats
POM-VVirbac
Leucogen Suspension for Injection for Cats
POM-VVirbac
Nobivac FeLV, Suspension for Injection for Cats
POM-VVirbac
Nobivac LeuFel Suspension for Injection for Cats
POM-VVirbac
Nobivac LeuFel Suspension for Injection for Cats
POM-VVirbac
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