Carrier

(Syn asymptomatic carrier) is a person infected without showing symptoms (hence, merely carrying the pathogen) or a person bearing the abnormal gene of a recessive disorder, i.e. a disorder that does not display symptoms if at least one of the two copies normally held for each gene is intact

Description
Carriers of infection can pass the pathogen on to others who might be susceptible and develop symptoms. Genetic carriers may pass their defective gene on to their offspring, where it might lead to disease if combined with an additional defective copy from the other parent. See also heterozygous and homozygous Other biomedical meanings include:
 * 1) any chemical capable of accepting an atom, radical, or subatomic particle from one compound, then passing it to another.
 * 2) a substance which, by having chemical properties closely related to or indistinguishable from those of a radioactive tracer, is able to carry the tracer through a precipitation or similar chemical procedure. See label, tracer
 * 3) a large immunogen which when coupled to a hapten will facilitate an immune response to the hapten