Question

Each year, many people get a flu shot to protect themselves from the flu. Why give flu shots rather than "booster" injections? Why is last year’s flu shot ineffective against this year’s flu? Discuss which of the following methods would be the best type of vaccination for fending off the flu, and explain your reasoning: A. IM (intramuscular) Injection B. Nasal Spray C. ID (intradermal) injection