Typhoid Mary

"Typhoid Mary" is a Human term for an individual who carries and is immune to a dangerous disease but spreads it to others. It originated in the 20th century from Mary Mallon, a cook in the New York area on Earth, who spread typhoid fever to dozens of individuals, but did not show any symptoms herself.

Doctor Leonard McCoy compared Doctor Sevrin, who carried, but was immune to Synthococcus novae, to "Typhoid Mary". 

When Seven of Nine began exhibiting multiple personalities in 2375 because of a dysfunctional Borg vinculum infected with a virus, The Doctor found that in this case, the "Typhoid Mary" was Species 6339 that carried a synthetic pathogen within their bodies; once they were assimilated by the Borg, the virus spread to the vinculum, which in turn caused havoc, leading to dysfunction and eventually the destruction of the Borg cube's drones. 

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Mary Mallon