During a routine checkup, a 72-year-old patient is advised to receive an influenza vaccine injection. He questions this, saying, “I had one last year. Why do I need another one?” What is an...

During a routine checkup, a 72-year-old patient is advised to receive an influenza vaccine injection. He questions this, saying, “I had one last year. Why do I need another one?” What is an appropriate response from the nurse? a “The effectiveness of the vaccine wears off after 6 months.” b “Each year a new vaccine is developed based on the flu strains that are likely to be in circulation.” c “When you reach 65 years of age, you need boosters on an annual basis.” d “Taking the flu vaccine each year allows you to build your immunity to a higher level each time.”