i thaut live vaccines have been around for ages? Nobivac parvo-c is a live vaccine, if you look at the clinical data it states the immunity lasts for at least 3 years. the reason its called live is because its a small dose of the actual illness that you want them to get immunity to and can be shed in small amounts for 8 days after vaccination and the animal can show symptoms of the illness vaccinated against, most vaccines start out as live vaccines. the safer vaccines are now killed so there is no risk of shedding the disease/virus after vaccination or showing the clinical symptoms of the ill