It means an unwarranted view of an "undetectable" individual as a source of HIV transmission.
That is, an individual that is "undetectable" (formerly HIV+ but underwent treatment so that the viral load is not detectable) is still viewed as a potential source of HIV transmission, despite assurances from the medical community that an undetectable load is unlikely to be a source of transmission.
That is, an individual that is "undetectable" (formerly HIV+ but underwent treatment so that the viral load is not detectable) is still viewed as a potential source of HIV transmission, despite assurances from the medical community that an undetectable load is unlikely to be a source of transmission.