"Annual boosters" refers to regular doses of a medicine or vaccine that need to be taken or injected once every year.
Sentences with «annual boosters»
As an adult dog, your puppy should then receive annual booster vaccinations. (scenichillsvet.com)
Current manufacturer's recommendations are for annual boosters for cat vaccines. (petvethospitals.com)
The best protection for puppies is vaccination with the first dose given at 5 weeks of age through 20 weeks of age with annual booster shots. (dog-health-handbook.com)