IPA: //nɒnˈkɛrɪər//
KK: /nɑnˈkɛrɪər/
A person who does not carry or transmit a disease or infection.
In a study of the virus, researchers found that many noncarriers showed no symptoms at all.
Noncarrier → It is formed from "non-" (meaning not) and "carrier" (from Latin "carriare", meaning to carry). The word "noncarrier" refers to someone or something that does not carry or transmit something, such as a disease.
Think of 'not' ('non-') carrying something ('carrier') — that's why a noncarrier does not transmit or carry something.