infection  
noun [ C or U ] uk/ɪnˈfek.ʃən/ us/ɪnˈfek.ʃən/
  (DISEASE)      
 B2 (由细菌或病毒造成的身体部位的)感染
a disease in a part of your body that is caused by bacteria or a virus
  a serious infection 严重的感染 
 a throat infection 咽喉感染 
 Bandage the wound to reduce the risk of infection. 包扎伤口以减少感染的危险。 
 - More examples
 - The breathing problem has now been complicated by a chest infection.
 - White blood cells help defend the body against infection.
 - He's on antibiotics for an ear infection.
 - They tested her blood for signs of the infection.
 - If the infection is not checked it will probably spread to the upper body.
 
  (COMPUTERS)      
 感染(计算机病毒)
an act of passing harmful programs into a computer or file, or the harmful programs themselves
  You only have to open an attachment to pass the infection from computer to computer. 你只要打开邮件附件就能感染计算机。