Question問題：
Per the CDC, what is the effectiveness of the influenza vaccine this influenza season?
根據美國CDC，在此次（今年）流感季節中，流感疫苗接種的有效率是什麼？
Answer答案：
The overall estimated effectiveness of seasonal influenza vaccine for preventing medically attended, laboratory-confirmed influenza virus infection is 45%.
（今年）季節性流感疫苗在預防就診並由實驗室證實流感感染的總體有效率為45%。
參考文獻：
MMWR Weekly, February 21, 2020
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