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carrier

noun [C] (SPREAD)
 
 
/ˈkær.i.ər/ US  /ˈker.i.ɚ/

Definition

someone who does not suffer from a disease but has the infection or genetic fault that causes it and can give the disease to someone else: There are an estimated 1.5 million HIV carriers in the country.Passing on illness and causing disease
(Definition of carrier noun (SPREAD) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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