Infectious diseases such as meningitis, measles, mumps and chronic ear infections can lead to hearing impairment, mostly in childhood, but also later in life.
如脑膜炎、麻疹、腮腺炎和慢性耳部感染等传染病可导致听力障碍，大多发生在童年，长大后也会发生。
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Information on the epidemiology of mumps disease during the campaign would be important for the understanding of reported rates of aseptic meningitis.