You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following statements is true regarding for influenza vaccine and explain in detail?
Answer.D. Aquatic birds are reservoirs* RESERVOIR: Humans are the principle reservoir of human influenza A viruses. The an reservoir of influenza A viruses is wild birds, predominantly ducks, geese, and shorebirds.* Seasonal influenza tends to target children younger than 12 months of age and adults 65 years old or older.* Secondary attack rates were estimated at 10.3% (95% CI 6.8-14.7) for secondary cases with influenza-like illness and 20.2% (95% CI 15.4-25.6) for secondary cases with acute respiratory illness.