seronegative
adjective medical specialized uk/ˌsɪə.rəʊˈneɡ.ə.tɪv/ us/ˌsɪr.oʊˈneɡ.ə.t̬ɪv/
血清反应阴性的
showing a negative result of a blood test for a particular antibody (= a substance in the blood that fights a disease)
children who remain seronegative after polio vaccinations 在接种脊髓灰质炎疫苗后血清反应呈阴性的儿童