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From seropositive +‎ -ity, or sero- +‎ positivity.


seropositivity (countable and uncountable, plural seropositivities)

  1. The quality or state of being seropositive, of having blood serum that tests positive for a given pathogen, especially HIV.
    • 1986, Institute of Medicine, National Academy of Sciences, Confronting AIDS: Directions for Public Health, Health Care, and Research,[1] National Academy Press, →ISBN, page 127:
      As discussed above, because of the severe consequences of HIV infection, a few states have required that ARC and even seropositivity be reported.
  2. Seropositivity rate, seroprevalence.