"Regular boosters" refers to something that provides regular or consistent increases in energy, strength, or improvement in a particular area. Full definition
While these vaccinations offer good protection, it is important that your cat receives regular booster injections on a yearly basis. (petpeoplesplace.com)
Regular vet visits can help your cat feel less stressed about the experience, get regular booster vaccinations, and reveal early warning symptoms of serious feline illnesses. (modkat.com)