simple past tense and past participle of reënter

Relating to immunohistopathology.

(of a woman or female animal) That has not given birth. / (of a mosquito or other female insect) That has not yet laid eggs.

The quality or state of being seropositive, of having blood serum that tests positive for a given pathogen, especially HIV. / Seropositivity rate, seroprevalence.