Nobivac® FeLV

Feline Leukemia Vaccine, KILLED VIRUS

The only vaccine with proven 2-year duration of immunity for feline leukemia virus (FeLV).1

Features and benefits

A quality core vaccine that protects against feline leukemia
  • The only feline leukemia vaccine labeled to prevent persistent viremia for 2 years after vaccination2
  • Superior Efficacy demonstrated vs. multiple FeLV vaccines 3,4
    • The ONLY USDA-licensed 2-Year Duration of Immunity (DOI) FeLV vaccine 1,2 (Ideal for adherence to AAFP guidelines5)
    • The ONLY vaccine to demonstrate efficacy over the long-term in a co-mingling study mimicking real life conditions1 
  • Proven safety profile-99% reaction-free in ongoing surveillance involving millions of doses1
  • Available in combination with other Nobivac® feline vaccines to provide broader disease protection
  • Optimal choice for all cats under 1 year of age and healthy indoor/outdoor cats of any age


  • Approved for the vaccination of healthy cats as an aid in the prevention of lymphoid tumors caused by, and diseases associated with, feline leukemia virus (FeLV) infection
  • Vaccination with this product prevents persistent viremia in cats exposed to virulent feline leukemia virus
  • Recommended for use in healthy cats 9 weeks of age or older

Safety information

  • 99.99% reaction-free in ongoing surveillance involving millions of doses1
  • Two-year duration of immunity means fewer vaccinations

Please see the product label for further safety information.

Administration and Dosage

For cats 9 weeks of age or older:

  • Subcutaneous or intramuscular injection
  • Initial 1-mL dose administered at 9 weeks of age or older
  • Second 1-mL dose administered 3 to 4 weeks later
  • Revaccination every 2 years with a single dose is recommended

For further information, including complete directions and warnings, please see the product label.

Product label(s) and MSDS


  1. Data on file, Merck Animal Health.
  2. Jirjis FF, Davis T, Lane J, et al. Protection against feline leukemia virus challenge for at least 2 years after vaccination with an inactivated feline leukemia virus vaccine. Vet Ther. 2010;11(2):E1–E6.
  3. Torres AN, O’Halloran KP, Larson LJ, Schultz RD, Hoover EA. Feline leukemia virus immunity induced by whole inactivated virus vaccination. Vet Immunol Immunopathol. 2010; 134 (1–2):122–131.
  4. Patel M, Carritt K, Lane J, Jayappa H, Stahl M, Bourgeois M. Comparative efficacy of feline leukemia virus inactivated whole virus vaccine and canarypox viris-vectored vaccine during virulent FeLV challenge and immunosuppression. Clin Vaccine Immunol. 2015
  5. American Association of Feline Practitioners. AAFP 2013 feline vaccination advisory panel report. J Feline Med Surgery. 2013; 15:785-808.