A carrier is someone who is infected with a disease and shows no clinical symptoms, but who is capable of infecting other people with the disease. ("Clinical" means "seen in the doctors office.")
HIV has been isolated (removed) and cultured ("grown" in a laboratory dish) from healthy people who show no clinical signs of HIV infection.
It is not yet clear when an HIV-infected person becomes infectious. At this time, the only safe practice is to assume that anyone carrying the virus is capable of transmitting it to others.
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