Antibody responses to SARS-CoV-2 in COVID-19 patients: the perspective application of serological tests in clinical practice

BackgroundWe aim to investigate the profile of acute antibody response in COVID-19 patients, and provide proposals for the usage of antibody test in clinical practice. MethodsA multi-center cross-section study (285 patients) and a single-center follow-up study (63 patients) were performed to investigate the feature of acute antibody response to SARS-CoV-2. A cohort of 52 COVID-19 suspects and 64 close contacts were enrolled to evaluate the potentiality of the antibody test. ResultsThe positive rate for IgG reached 100% around 20 days after symptoms onset. The median day of seroconversion for both lgG and IgM was 13 days after symptoms onset. Seroconversion of IgM occurred at the same time, or earlier, or later than that of IgG. IgG levels in 100% patients (19/19) entered a platform within 6 days after seroconversion. The criteria of IgG seroconversion and > 4-fold increase in the IgG titers in sequential samples together diagnosed 82.9% (34/41) of the patients. Antibody test aided to confirm 4 patients with COVID-19 from 52 suspects who failed to be confirmed by RT-PCR and 7 patients from 148 close contacts with negative RT-PCR. ConclusionIgM and IgG should be detected simultaneously at the early phase of infection. The serological diagnosis criterion of seroconversion or the >; 4-fold increase in the IgG titer is suitable for a majority of COVID-19 patients. Serologic test is helpful for the diagnosis of SARS-CoV-2 infection in suspects and close contacts.

Long-term health-related quality of life in chronic hepatitis B patients / 中华肝脏病杂志

<p><b>OBJECTIVE</b>To evaluate their long-term outcome and the efficacy and economic significance of antiviral drugs by investigating the long-term health-related quality of life (HQL) in chronic hepatitis B (CHB) patients.</p><p><b>METHODS</b>The HQL of 101 CHB patients with biopsy-proven 6 to 18 years ago and 105 persons of general population as control was studied with revised SF-36 questionnaire.</p><p><b>RESULTS</b>The HQL in CHB patients was lower than that in general population in physical functioning, role physical, general health, mental health, and specific symptoms (mu > or = 2.10, P<0.05).</p><p><b>CONCLUSIONS</b>The long-term HQL in chronic hepatitis B patients is poor.</p>

A study on the long-term outcome of hepatitis B e antigen-negative chronic hepatitis B compared with that of hepatitis B e antigen-positive chronic hepatitis B / 中华传染病杂志

0.05)between the two groups.Conclu- sion The long-term outcomes of e-CHB is not markedly different compared with that of e+CHB.