RÉSUMÉ
Because of limited viral replication and lack of cytopathic effect in cell culture, a new PCR-based rapid seroneutralization assay for detection of GII.4 norovirus neutralized antibodies was developed with serum samples from acute-phase patients, convalescent-phase patients and healthy controls. According to this study, neutralizing antibodies were detected in 100% of convalescent-phase sera, and in 2.5% of healthy controls sera. However, all of the acute-phase serum samples could not neutralize virus efficiently. Compared to the results from ELISA (96.2% at sensitivity and 80% at specificity), the present in vitro neutralization assay is more specific and more sensitive.
Sujet(s)
Humains , Anticorps neutralisants , Allergie et immunologie , Séquence nucléotidique , Infections à Caliciviridae , Diagnostic , Virologie , Études cas-témoins , Lignée cellulaire , Amorces ADN , Test ELISA , Gastroentérite , Diagnostic , Virologie , Norovirus , Allergie et immunologie , Réaction de polymérisation en chaîne , Méthodes , Sensibilité et spécificitéRÉSUMÉ
<p><b>OBJECTIVE</b>To investigate clinical and molecule genetics features of four Ph-positive leukemia patients characterized by pericentric inv(9)(p22q34) with the der(9)t(9;22)(q34;q11).</p><p><b>METHODS</b>Cytogenetic analysis was carried out on bone marrow directly or after short-period culture. R banding was used for karyotype analysis. BCR/ABL fusion gene was detected with interphase fluorescence in situ hybridization (FISH), and chromosome painting was carried out using specific probes. RT-PCR was used to detect BCR/ABL chimeric transcripts.</p><p><b>RESULTS</b>One patient with acute myeloid leukemia (AML) presented three clones, which included one with a normal karyotype, one with t(9;22)(q34;q11), and one with inv(9)(p22q34) involving the der(9)t(9;22) and additional t(8;12)(q12;p11). The inv(9)(p22q34) has always co-occurred with der(9)t(9;22)(q34;q11) accompanied by der(22)t(9;22)(q34;q11) in all metaphases from the three patients with chronic myeloid leukemia (CML). B3a2 transcript was detected in all patients by RT-PCR. Inv(9)(p22q34) was found in both CML and AML, and was associated with poor prognosis.</p><p><b>CONCLUSION</b>Inv(9)(p22q34) is a novel, rare, but recurrent secondary chromosomal abnormality for Ph-positive leukemia. Leukemia with der(9)t(9;22) and inv(9)(p22q34) has unique clinical and laboratory characteristics.</p>