scholarly journals ESTIMATES OF RECENT HIV INFECTION IN THE POPULATION BY FREQUENCY OF OCCURRENCE P24 ANTIGEN AND IN THE KIT DISTINGUISH RECENT FROM LONGSTANDING INFECTION

2020 ◽  
Vol 12 (1) ◽  
pp. 68-74
Author(s):  
D. A. Neshumaev ◽  
E. M. Meirmanova ◽  
O. N. Kuntsevich ◽  
S. E. Skudarnov ◽  
V. L. Stasenko
Keyword(s):  
Hiv Infection ◽  
Correlation Coefficient ◽  
Statistical Processing ◽  
Diagnostic Algorithm ◽  
Close Correlation ◽  
Test System ◽  
Frequency Of Occurrence ◽  
True Value ◽  
P24 Antigen ◽  
Recent Hiv Infection

Aim: to compare the incidence of recent cases of HIV infection in the population, recorded by the presence of p24 antigen and in thekit distinguish recent from longstanding infection.Materials and methods. Evaluation of recent HIV infection was carried out through studies of two cohorts of patients: 1) persons with negative / undetermined result of an immune blot and p24 antigen; 2) individuals with positive immune blot who were additionally studied using a test system to determine the duration of infection. Randomly in 2011, 2013, 2014 and 2015, 22%, 17%, 44% and 6% of all newly identified patients with a positive immune blot, respectively, were examined. Statistical processing, correlation coefficient and confidence intervals were calculated using Student’s t-test.Results. There is a close correlation between the detection rate of the p24 antigen of HIV and the frequency of occurrence of recent cases of infection registered among newly identified individuals with positive immune blot (the period of probable infection is less than 9 months). Correlation coefficient =0,91, p<0,05.Conclusion. The established dependence allows one to estimate the recent cases of infection in the population by a calculated method using only the frequency of occurrence of the p24 antigen included in the standard diagnostic algorithm of HIV infection. A formula is proposed in accordance with which it is necessary to add 0,6±0,2 to the frequency of occurrence of the p24 antigen expressed per 1000 individuals covered by screening. With a probability of 95%, the true value of the frequency of occurrence of recent cases of infections in a population will be in the calculated confidence interval.

scholarly journals Complex control of coordination and speed-power abilities in fire-applied sports

2020 ◽  
Vol 24 (6) ◽  
pp. 310-315
Author(s):  
Georgiy G. Polevoy ◽  
Irina V. Strelnikowa
Keyword(s):  
Correlation Coefficient ◽  
Pearson Correlation ◽  
Statistical Processing ◽  
Close Correlation ◽  
Pearson Correlation Coefficient ◽  
Correlation Relationship ◽  
Complex Control ◽  
Complex Monitoring ◽  
In Fire ◽  
Metrological Requirements

Background and Study Aim. To identify informative tests for complex control of coordination and speed-power abilities in fire-applied sports. Material and Methods. 38 experienced firefighter-athletes aged 15-17, who have been doing this sport for 5-6 years, took part in the research. The survey of Russian leading coaches allowed us to make up a bank of 20 tests. The Brave-Pearson correlation coefficient was used in the statistical processing of the results. The research results were processed using the Excel program. Results: Methods of controlling coordination and speed-power abilities with competitive result when overcoming a 100-meter obstacle course in fire-applied sports were experimentally substantiated. In accordance with the basic metrological requirements, close correlation relationship was found for 10 tests. Conclusion: Fire-applied sports is a complex technical type, to control the development of coordination and speed-power abilities it is necessary to rely not on one test, but on a bank of them. The identified informative tests can be recommended for complex monitoring of coordination and speed-power preparedness in fire-applied sports.

scholarly journals Evaluation of the Abbott ARCHITECT HIV Ag/Ab combo assay for determining recent HIV-1 infection

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0242641
Author(s):  
Kelly A. Curtis ◽  
Donna L. Rudolph ◽  
Yi Pan ◽  
Kevin Delaney ◽  
Kathryn Anastos ◽  
...  
Keyword(s):  
Hiv Infection ◽  
Diagnostic Test ◽  
Diagnostic Algorithm ◽  
The United States ◽  
Hiv Incidence ◽  
Test Protocol ◽  
Recent Infection ◽  
Recent Hiv Infection ◽  
Hiv 1 ◽  
Abbott Architect

Background Given the challenges and costs associated with implementing HIV-1 incidence assay testing, there is great interest in evaluating the use of commercial HIV diagnostic tests for determining recent HIV infection. A diagnostic test with the capability of providing reliable data for the determination of recent HIV infection without substantial modifications to the test protocol would have a significant impact on HIV surveillance. The Abbott ARCHITECT HIV Ag/Ab Combo Assay is an antigen/antibody immunoassay, which meets the criteria as the first screening test in the recommended HIV laboratory diagnostic algorithm for the United States. Methods In this study, we evaluated the performance characteristics of the ARCHITECT HIV Ag/Ab Combo signal-to-cutoff ratio (S/Co) for determining recent infection, including estimation of the mean duration of recent infection (MDRI) and false recent rate (FRR), and selection of recency cutoffs. Results The MDRI estimates for the S/Co recency cutoff of 400 is within the 4 to 12 months range recommended for HIV incidence assays, and the FRR rate for this cutoff was 1.5%. Additionally, ARCHITECT Combo S/Co values were compared relative to diagnostic test results from two prior prospective HIV-1 diagnostic studies in order to validate the use of the S/Co for both diagnostic and recency determination. Conclusion Dual-use of the ARCHITECT Combo assay data for diagnostic and incidence purposes would reduce the need for separate HIV incidence testing and allow for monitoring of recent infection for incidence estimation and other public health applications.

scholarly journals Evaluation of the Abbott ARCHITECT HIV Ag/Ab Combo Assay for Determining Recent HIV-1 Infection

2020 ◽  
Author(s):  
Kelly A. Curtis ◽  
Donna L. Rudolph ◽  
Yi Pan ◽  
Kevin Delaney ◽  
Kathryn Anastos ◽  
...  
Keyword(s):  
Hiv Infection ◽  
Diagnostic Test ◽  
Diagnostic Algorithm ◽  
The United States ◽  
Hiv Incidence ◽  
Test Protocol ◽  
Recent Infection ◽  
Recent Hiv Infection ◽  
Hiv 1 ◽  
Abbott Architect

BackgroundGiven the challenges and costs associated with implementing HIV-1 incidence assay testing, there is great interest in evaluating the use of commercial HIV diagnostic tests for determining recent HIV infection. A diagnostic test with the capability of providing reliable data for the determination of recent HIV infection without substantial modifications to the test protocol would have a significant impact on HIV surveillance. The Abbott ARCHITECT HIV Ag/Ab Combo Assay is an antigen/antibody immunoassay, which meets the criteria as the first screening test in the recommended HIV laboratory diagnostic algorithm for the United States.MethodsIn this study, we evaluated the performance characteristics of the ARCHITECT HIV Ag/Ab Combo signal-to-cutoff ratio (S/Co) for determining recent infection, including estimation of the mean duration of recent infection (MDRI) and false recent rate (FRR), and selection of recency cutoffs.ResultsThe MDRI estimates for the S/Co recency cutoff of 400 is within the 4 to 12 months range recommended for HIV incidence assays, and the FRR rate for this cutoff was 1.5%. Additionally, ARCHITECT Combo S/Co values were compared relative to diagnostic test results from two prior prospective HIV-1 diagnostic studies in order to validate the use of the S/Co for both diagnostic and recency determination.ConclusionDual-use of the ARCHITECT Combo assay data for diagnostic and incidence purposes would reduce the need for separate HIV incidence testing and allow for monitoring of recent infection for incidence estimation and other public health applications.

scholarly journals Use of multiple recreational drugs is associated with new HIV infections among men who have sex with men in China: a multicenter cross-sectional survey

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Xiang Mao ◽  
Sequoia I. Leuba ◽  
Qinghai Hu ◽  
Hongjing Yan ◽  
Zhe Wang ◽  
...  
Keyword(s):  
High Risk ◽  
Hiv Infection ◽  
Risk Behaviors ◽  
Sexual Behaviors ◽  
Hiv Infections ◽  
Recreational Drugs ◽  
Limited Information ◽  
High Risk Behaviors ◽  
Sex With Men ◽  
Recent Hiv Infection

Abstract Background There is limited information about the types of recreational drugs used by men who have sex with men (MSM) in China or the consequent impact on sexual health and human immunodeficiency virus (HIV) acquisition. Methods We recruited MSM from seven cities in China between 2012 and 2013 using multiple approaches including advertisements on gay websites, collaborating with local MSM community-based organizations, peer referrals, and venues such as gay bars and bathrooms visited by MSM. We divided participants into four subgroups based on the number of recreational drugs (RDs) used in the previous 6 months. We defined use of multiple RDs as use of ≥2 types of RDs. Demographics and HIV-related high-risk behaviors were collected, and blood samples were tested for recent HIV infection by the HIV-1 subtypes B, E, and D immunoglobulin G capture enzyme immunoassay (BED-CEIA). We used multivariable logistic regression adjusted for sociodemographics to determine the adjusted odds ratios (aORs) and associated 95% confidence intervals (CIs) of the subgroups of RD use for recent or established HIV infection. Results A total of 4496 Chinese MSM participated; 28.4% used RDs, and 5% used multiple types of RDs. The prevalence of each RD use was as follows: poppers (25.9%), ecstasy (2.4%), ketamine (1.2%), amphetamine (0.6%), tramadol (0.4%), methamphetamine (3.8%), and codeine (1.9%). Users of multiple RDs commonly used poppers combined with one or more other types of RDs. Multiple RD users were likely to be aged 26–30 years (vs. 18–25 and > 30 years), live in non-local cities (vs. local cities), never married (vs. married), have a high monthly income (vs. no income and 1–599 USD), use versatile positions during anal intercourse (vs. top or bottom), and have inadequate HIV-related prevention knowledge (vs. adequate). As the number of RDs used in the previous 6 months increased, the prevalence of HIV-related high-risk behaviors increased (P < 0.05 for all). The odds of recent HIV infection were higher among those who used one type (aOR = 2.2, 95% CI: 1.5–3.0) or two types of RD (aOR=2.3, 95% CI: 1.0-5.2) in the previous 6 months compared to the odds among those who did not use RDs. Conclusion The level and pattern of multiple RD use among Chinese MSM were different from high-income countries. MSM who used more RDs are more likely to engage in high-risk sexual behaviors, and these behaviors may be associated with increases in new HIV infections.

scholarly journals Transmitted drug resistance to Tenofovir/Emtricitabine among persons with newly diagnosed HIV infection in Shenyang city, Northeast China from 2016 to 2018

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Zhen Wang ◽  
Bin Zhao ◽  
Minghui An ◽  
Wei Song ◽  
Xue Dong ◽  
...  
Keyword(s):  
Drug Resistance ◽  
Hiv Infection ◽  
Northeast China ◽  
Transmitted Drug Resistance ◽  
Newly Diagnosed ◽  
Resistance Mutations ◽  
Shenyang City ◽  
Subtype B ◽  
Recent Hiv Infection ◽  
Hiv 1

Abstract Background To assess transmitted drug resistance (TDR) to tenofovir (TDF)/emtricitabine (FTC), using as pre-exposure prophylaxis, among newly diagnosed human immunodeficiency virus-1 (HIV-1)-infected residents in Shenyang city, northeast China. Methods Demographic and epidemiological information of all newly diagnosed HIV-1 infected residents in Shenyang city from 2016 to 2018 were anonymously collected from the local HIV epidemic database. HIV-1 pol sequences were amplified from RNA in cryopreserved plasma samples and sequenced directly. Viral subtypes were inferred with phylogenetic analysis and drug resistance mutations (DRMs) were determined according to the Stanford HIVdb algorithm. Recent HIV infection was determined with HIV Limiting Antigen avidity electro immunoassay. Results A total of 2176 sequences (92.4%, 2176/2354) were obtained; 70.9% (1536/2167) were CRF01_AE, followed by CRF07_BC (18.0%, 391/2167), subtype B (4.7%, 102/2167), other subtypes (2.6%, 56/2167), and unique recombinant forms (3.8%, 82/2167). The prevalence of TDR was 4.9% (107/2167), among which, only 0.6% (13/2167) was resistance to TDF/FTC. Most of these subjects had CRF01_AE strains (76.9%, 10/13), were unmarried (76.9%, 10/13), infected through homosexual contact (92.3%, 12/13), and over 30 years old (median age: 33). The TDF/FTC DRMs included K65R (8/13), M184I/V (5/13), and Y115F (2/13). Recent HIV infection accounted for only 23.1% (3/13). Most cases were sporadic in the phylogenetic tree, except two CRF01_AE sequences with K65R (Bootstrap value: 99%). Conclusions The prevalence of TDR to TDF/FTC is low among newly diagnosed HIV-infected cases in Shenyang, suggesting that TDR may have little impact on the protective effect of the ongoing CROPrEP project in Shenyang city.

scholarly journals Epidemiological factors associated with recent HIV infection among newly-diagnosed cases in Singapore, 2013–2017

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Li Wei Ang ◽  
Carmen Low ◽  
Chen Seong Wong ◽  
Irving Charles Boudville ◽  
Matthias Paul Han Sim Toh ◽  
...  
Keyword(s):  
Early Diagnosis ◽  
Hiv Infection ◽  
Hiv Transmission ◽  
Risk Groups ◽  
Newly Diagnosed ◽  
Hiv Diagnosis ◽  
Factors Associated ◽  
Epidemiological Factors ◽  
Voluntary Testing ◽  
Recent Hiv Infection

AbstractBackgroundEarly diagnosis is crucial in securing optimal outcomes in the HIV care cascade. Recent HIV infection (RHI) serves as an indicator of early detection in the course of HIV infection. Surveillance of RHI is important in uncovering at-risk groups in which HIV transmission is ongoing. The study objectives are to estimate the proportion of RHI among persons newly-diagnosed in 2013–2017, and to elucidate epidemiological factors associated with RHI in Singapore.MethodsAs part of the National HIV Molecular Surveillance Programme, residual plasma samples of treatment-naïve HIV-1 positive individuals were tested using the biotinylated peptide-capture enzyme immunoassay with a cutoff of normalized optical density ≤ 0.8 for evidence of RHI. A recent infection testing algorithm was applied for the classification of RHI. We identified risk factors associated with RHI using logistic regression analyses.ResultsA total of 701 newly-diagnosed HIV-infected persons were included in the study. The median age at HIV diagnosis was 38 years (interquartile range, 28–51). The majority were men (94.2%), and sexual route was the predominant mode of HIV transmission (98.3%). Overall, 133/701 (19.0, 95% confidence interval [CI] 16.2–22.0%) were classified as RHI. The proportions of RHI in 2015 (31.1%) and 2017 (31.0%) were significantly higher than in 2014 (11.2%). A significantly higher proportion of men having sex with men (23.4, 95% CI 19.6–27.6%) had RHI compared with heterosexual men (11.1, 95% CI 7.6–15.9%). Independent factors associated with RHI were: age 15–24 years (adjusted odds ratio [aOR] 4.18, 95% CI 1.69–10.31) compared with ≥55 years; HIV diagnosis in 2015 (aOR 2.36, 95% CI 1.25–4.46) and 2017 (aOR 2.52, 95% CI 1.32–4.80) compared with 2013–2014; detection via voluntary testing (aOR 1.91, 95% CI 1.07–3.43) compared with medical care; and self-reported history of HIV test(s) prior to diagnosis (aOR 1.72, 95% CI 1.06–2.81).ConclusionAlthough there appears to be an increasing trend towards early diagnosis, persons with RHI remain a minority in Singapore. The strong associations observed between modifiable behaviors (voluntary testing and HIV testing history) and RHI highlight the importance of increasing the accessibility to HIV testing for at-risk groups.

scholarly journals Streptavidin-conjugated gold nanoclusters as ultrasensitive fluorescent sensors for early diagnosis of HIV infection

2018 ◽  
Vol 4 (11) ◽  
pp. eaar6280 ◽  
Author(s):  
Aditya Dileep Kurdekar ◽  
L. A. Avinash Chunduri ◽  
C. Sai Manohar ◽  
Mohan Kumar Haleyurgirisetty ◽  
Indira K. Hewlett ◽  
...  
Keyword(s):  
Hiv Infection ◽  
Limit Of Detection ◽  
Gold Nanoclusters ◽  
Enzyme Linked Immunosorbent Assay ◽  
Dependent Manner ◽  
Metal Nanoclusters ◽  
Detection Range ◽  
In Silico Studies ◽  
P24 Antigen ◽  
Hiv 1

We have engineered streptavidin-labeled fluorescent gold nanoclusters to develop a gold nanocluster immunoassay (GNCIA) for the early and sensitive detection of HIV infection. We performed computational simulations on the mechanism of interaction between the nanoclusters and the streptavidin protein via in silico studies and showed that gold nanoclusters enhance the binding to the protein, by enhancing interaction between the Au atoms and the specific active site residues, compared to other metal nanoclusters. We also evaluated the role of glutathione conjugation in binding to gold nanoclusters with streptavidin. As proof of concept, GNCIA achieved a sensitivity limit of detection of HIV-1 p24 antigen in clinical specimens of 5 pg/ml, with a detection range up to1000 pg/ml in a linear dose-dependent manner. GNCIA demonstrated a threefold higher sensitivity and specificity compared to enzyme-linked immunosorbent assay for the detection of HIV p24 antigen. The specificity of the immunoassay was 100% when tested with plasma samples negative for HIV-1 p24 antigen and positive for viruses such as hepatitis B virus, hepatitis C virus, and dengue. GNCIA could be developed into a universal labeling technology using the relevant capture and detector antibodies for the specific detection of antigens of various pathogens in the future.

Rapid Serologic Testing with Immune-Complex-Dissociated HIV p24 Antigen for Early Detection of HIV Infection in Neonates

1993 ◽  
Vol 328 (5) ◽  
pp. 297-302 ◽  
Author(s):  
Steven A. Miles ◽  
Erin Balden ◽  
Larry Magpantay ◽  
LeAnn Wei ◽  
Alison Leiblein ◽  
...  
Keyword(s):  
Early Detection ◽  
Hiv Infection ◽  
Immune Complex ◽  
Serologic Testing ◽  
P24 Antigen
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