Nobivac FeLV is a feline leukemia vaccine labeled to prevent persistent viremia for 2 years after vaccination. This vaccine is 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. This vaccine is the optimal choice for healthy outdoor cats. This is a killed version of the virus. Recommended for the use in healthy cats 9 weeks of age or older. Nobivac FeLV protects your cat against feline Leukemia Prevents persistent viremia for 2 years after vaccination Killed virus Optimal choice for healthy outdoor cats Made in the USA Nobivac is a registered trademark of Intervet Inc., d/b/a Merck Animal Health, a subsidiary of Merck & Co. Inc.