But once either of your immune systems have been programmed by an initial series of vaccinations to fight against core diseases, it stays immune. (2ndchance.info)
If your pet was properly vaccinated as a puppy or kitten, chances are he's protected for life from core diseases. (healthypets.mercola.com)
They are also receiving combination vaccines for core diseases like distemper and adenovirus, and in some regions they're also receiving Lyme, leptospirosis and / or other non-core vaccines. (healthypets.mercola.com)