I'd like to remind you of the usage of "infectious" and "infective." Please notice that the frequency of "infectious" is higher than that of "infective."
adj 1: caused by infection or capable of causing infection; viruses
and other infective agents"; "a carrier remains
infective without himself showing signs of the
disease" [syn: infective]
2: easily spread; "fear is exceedlingly infectious; children
catch it from their elders"- Bertrand Russell [ant: noninfectious]