intended to prevent flu (= a common infectious illness that causes fever and headache) or reduce itsintended to prevent flu (= a common infectious illness that causes fever and headache) or reduce its
The government\'s anti-flu campaign was hampered by a shortage of vaccine.
abbreviation for Middle East Respiratory Syndrome: a serious infectious illness that causes difficulabbreviation for Middle East Respiratory Syndrome: a serious infectious illness that causes difficul
中东呼吸综合征（Middle East Respiratory Syndrome 的缩写）
B1 a common infectious illness that causes fever and headache:B1 a common infectious illness that causes fever and headache:
a flu virus
B1 a common infectious illness that causes fever and headacheB1 a common infectious illness that causes fever and headache
流行性感冒，流感 a flu virus 流感病毒
