a) Transmitted from one person to another, usually through the air breathed.

Cancer is not infectious.

b) Able to infect others.

More infectious diseases like the flu are usually less potent.

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  • infectious — in|fec|tious [ ın fekʃəs ] adjective * 1. ) an infectious disease is one that can spread from one person to another: The condition is highly infectious. a ) used about a person or animal that has an infectious disease: The animals were still… …   Usage of the words and phrases in modern English

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