Background:The prevalence of schistosomiasis japonica has decreased significantly,and the responses changing from control to elimination in Jiangsu Province,P.R.China.How to estimate the change in prevalence of schist...Background:The prevalence of schistosomiasis japonica has decreased significantly,and the responses changing from control to elimination in Jiangsu Province,P.R.China.How to estimate the change in prevalence of schistosomiasis using only serological data will be important and useful.Methods:We collected serum samples from 2011 to 2015 to build a serum bank from Dantu County of Jiangsu,China.Serum samples were detected by enzyme-linked immunosorbent assay(ELISA),the positive rate and optical density(OD)value were obtained.The Bayesian model including the prior information of sensitivity and specificity of ELISA was established,and the estimated infection rates were obtained for different years,genders and age groups.Results:There was no significant difference in the mean OD between different years and genders,but there was a significant difference between the different age groups.There were statistically significant differences in the positive rate for different years and age groups,but no significant difference at different genders.The estimated infection rate for the five years was 1.288,1.456,1.032,1.485 and 1.358%,respectively.There was no significant difference between different years and between genders,but a significant difference between different age groups.Conclusions:The risk of schistosomiasis transmission in this area still exists,and risk monitoring of schistosomiasis should be strengthened.展开更多
AIM:To study the diagnosis of Helicobacter pylori(H pylori) infection through the determination of serum levels of anti- H pylori IgG and IgA antibodies,and the levels of anti-H pylori IgA antibodies in duodenal fluid...AIM:To study the diagnosis of Helicobacter pylori(H pylori) infection through the determination of serum levels of anti- H pylori IgG and IgA antibodies,and the levels of anti-H pylori IgA antibodies in duodenal fluid. METHODS:Data were collected from 93 patients submitted to upper digestive endoscopy due to dyspeptic symptoms. The patients were either negative(group A)or positive (group B)to H pylori by means of both histological detection and urease tests.Before endoscopy,peripheral blood was collected for the investigation of anti-H pylori IgG and IgA antibodies.To perform the urease test,biopsies were obtained from the gastric antrum.For the histological evaluation,biopsies were collected from the gastric antrum (greater and lesser curvatures)and the gastric body. Following this,duodenal fluid was collected from the first and second portions of the duodenum.For the serological assaying of anti-Hpylori IgG and IgA,and anti-Hpylori IgA in duodenal fluids,the ELISA method was utilized. RESULTS:The concentration of serum IgG showed sensitivity of 64.0%,specificity of 83.7%,positive predictive value of 82.0%,negative predictive value of 66.6% and accuracy of 73.1% for the diagnosis of H pylori infection.For the same purpose,serum IgA showed sensitivity of 72.0%, specificity of 65.9%,positive predictive value of 72.0%, negative predictive value of 67.4% and accuracy of 69.8%. If the serological tests were considered together,i.e.when both were positive or negative,the accuracy was 80.0%, sensitivity was 86.6%,specificity was 74.2%,positive predictive value was 74.2% and negative predictive value was 86.6%.When values obtained in the test for detecting IgA in the duodenal fluid were analyzed,no significant difference(P=0.43)was observed between the values obtained from patients with or without H pylori infection. CONCLUSION:The results of serum IgG and IgA tests for H pylori detection when used simultaneously,are more efficient in accuracy,sensitivity and negative predictive value, than those when used alone.The con展开更多
Like antibody evaluation,using an effective antigen‐specific T‐cell immunity assessment method in coronavirus disease 2019(COVID‐19)patients,survivors and vaccinees is crucial for understanding the immune persisten...Like antibody evaluation,using an effective antigen‐specific T‐cell immunity assessment method in coronavirus disease 2019(COVID‐19)patients,survivors and vaccinees is crucial for understanding the immune persistence,prognosis assessment,and vaccine development for COVID‐19.This study evaluated an empirically adjusted enzyme‐linked immunospot assay for detecting severe acute respiratory syndrome coronavirus 2(SARS‐CoV‐2)‐specific T‐cell immunity in 175 peripheral blood samples from COVID‐19 convalescents and healthy individuals.Results of viral nucleic acid were used as the gold standard of infection confirmation.The SARS‐CoV‐2M peptide pool had higher sensitivity of 85%and specificity of 71%for the single peptide pool.For combined peptide pools,the parallel evaluation(at least one of the peptide pools is positive)of total peptide pools(S1&S2&M&N)had higher sensitivity(up to 93%),and the serial evaluation(all peptide pools are positive)of total peptide pools had higher specificity(up to 100%).The result of the serial evaluation was better than that of the parallel evaluation as a whole.The detection efficiency of M and N peptide pool serial evaluation appeared the highest,with a sensitivity of 80%and specificity of 93%.This T‐cell immunity detection assay introduced in this report can achieve high operability and applicability.Therefore,it can be an effective SARS‐CoV‐2‐specific cellular immune function evaluation method.展开更多
基金This project was supported by the National S&T Major Program(grant no.2012ZX10004220)Project of National Natural Science Foundation of China(No.81101275)Capacity improvement project of Jiangsu Public Welfare Institute(No.BM2015024).
文摘Background:The prevalence of schistosomiasis japonica has decreased significantly,and the responses changing from control to elimination in Jiangsu Province,P.R.China.How to estimate the change in prevalence of schistosomiasis using only serological data will be important and useful.Methods:We collected serum samples from 2011 to 2015 to build a serum bank from Dantu County of Jiangsu,China.Serum samples were detected by enzyme-linked immunosorbent assay(ELISA),the positive rate and optical density(OD)value were obtained.The Bayesian model including the prior information of sensitivity and specificity of ELISA was established,and the estimated infection rates were obtained for different years,genders and age groups.Results:There was no significant difference in the mean OD between different years and genders,but there was a significant difference between the different age groups.There were statistically significant differences in the positive rate for different years and age groups,but no significant difference at different genders.The estimated infection rate for the five years was 1.288,1.456,1.032,1.485 and 1.358%,respectively.There was no significant difference between different years and between genders,but a significant difference between different age groups.Conclusions:The risk of schistosomiasis transmission in this area still exists,and risk monitoring of schistosomiasis should be strengthened.
文摘AIM:To study the diagnosis of Helicobacter pylori(H pylori) infection through the determination of serum levels of anti- H pylori IgG and IgA antibodies,and the levels of anti-H pylori IgA antibodies in duodenal fluid. METHODS:Data were collected from 93 patients submitted to upper digestive endoscopy due to dyspeptic symptoms. The patients were either negative(group A)or positive (group B)to H pylori by means of both histological detection and urease tests.Before endoscopy,peripheral blood was collected for the investigation of anti-H pylori IgG and IgA antibodies.To perform the urease test,biopsies were obtained from the gastric antrum.For the histological evaluation,biopsies were collected from the gastric antrum (greater and lesser curvatures)and the gastric body. Following this,duodenal fluid was collected from the first and second portions of the duodenum.For the serological assaying of anti-Hpylori IgG and IgA,and anti-Hpylori IgA in duodenal fluids,the ELISA method was utilized. RESULTS:The concentration of serum IgG showed sensitivity of 64.0%,specificity of 83.7%,positive predictive value of 82.0%,negative predictive value of 66.6% and accuracy of 73.1% for the diagnosis of H pylori infection.For the same purpose,serum IgA showed sensitivity of 72.0%, specificity of 65.9%,positive predictive value of 72.0%, negative predictive value of 67.4% and accuracy of 69.8%. If the serological tests were considered together,i.e.when both were positive or negative,the accuracy was 80.0%, sensitivity was 86.6%,specificity was 74.2%,positive predictive value was 74.2% and negative predictive value was 86.6%.When values obtained in the test for detecting IgA in the duodenal fluid were analyzed,no significant difference(P=0.43)was observed between the values obtained from patients with or without H pylori infection. CONCLUSION:The results of serum IgG and IgA tests for H pylori detection when used simultaneously,are more efficient in accuracy,sensitivity and negative predictive value, than those when used alone.The con
基金supported by the National Natural Science Foundation of China(82161148008 and 81971501)the National Key Research and Development Program of China(2021YFC2301400)+1 种基金Beijing Municipal Science and Technology Project(Z211100002521015&Z211100002521017)In addition,W.J.L.is supported by the Excellent Young Scientist Program of the National Natural Science Foundation of China(81822040).
文摘Like antibody evaluation,using an effective antigen‐specific T‐cell immunity assessment method in coronavirus disease 2019(COVID‐19)patients,survivors and vaccinees is crucial for understanding the immune persistence,prognosis assessment,and vaccine development for COVID‐19.This study evaluated an empirically adjusted enzyme‐linked immunospot assay for detecting severe acute respiratory syndrome coronavirus 2(SARS‐CoV‐2)‐specific T‐cell immunity in 175 peripheral blood samples from COVID‐19 convalescents and healthy individuals.Results of viral nucleic acid were used as the gold standard of infection confirmation.The SARS‐CoV‐2M peptide pool had higher sensitivity of 85%and specificity of 71%for the single peptide pool.For combined peptide pools,the parallel evaluation(at least one of the peptide pools is positive)of total peptide pools(S1&S2&M&N)had higher sensitivity(up to 93%),and the serial evaluation(all peptide pools are positive)of total peptide pools had higher specificity(up to 100%).The result of the serial evaluation was better than that of the parallel evaluation as a whole.The detection efficiency of M and N peptide pool serial evaluation appeared the highest,with a sensitivity of 80%and specificity of 93%.This T‐cell immunity detection assay introduced in this report can achieve high operability and applicability.Therefore,it can be an effective SARS‐CoV‐2‐specific cellular immune function evaluation method.
