noncarrier       
noun [ C ] (also non-carrier) uk/ˌnɒnˈkær.i.ər/ us/ˌnɑːnˈker.i.ɚ/
 非病毒携带者;非缺陷基因携带者
someone who does not have an infection or fault in their genes (= parts of the DNA in cells that are passed on from their parents) that causes a disease
  We compared the risk of disease in carriers to that in noncarriers. 我们比较了病毒携带者和非携带者患病的风险。 
 The incidence of cancer among non-carriers of the faulty gene was very low. 非缺陷基因携带者的癌症发病率非常低。 
 - More examples
 - They compared the incidence of cancer between family members who carried the mutation and noncarriers.
 - Younger non-carriers should not need to have annual screening.
 - Of the 269 cases examined, 35% were carriers of the gene and 65% were noncarriers.
 - Two of the patients were carriers and nine were non-carriers.