scholarly journals Detection of NS1 antigen, IgM and IgG antibodies using a commercial Dengue rapid test kit for the diagnosis of dengue infection in patients with acute febrile illness

2021 ◽  
Vol 8 (3) ◽  
pp. 235-238
Author(s):  
Nalamanda Suma ◽  
T Sarada
Keyword(s):  
Solid Phase ◽  
Serological Test ◽  
Dengue Infection ◽  
Rapid Test ◽  
Febrile Illness ◽  
Acute Febrile Illness ◽  
Igg Antibodies ◽  
Igm Antibody ◽  
Test Kit ◽  
Ns1 Antigen

Dengue is an endemic arboviral illness. With the increasing incidence of dengue infection, an early diagnostic confirmation of dengue infection in patients facilitates timely clinical intervention, etiological investigation, and disease control. Objective of this study was to evaluate a commercially available serological test kit - Dengue Day 1 Test. This is for the detection of dengue NS1 antigen, differential detection of IgM and IgG antibodies on a single acute serum sample. Atotal of 100 patients with acute febrile illness were included in this study. Serum samples were analysed for Dengue NS1 Ag, IgM & IgG Antibodies using a commercially available Dengue Day 1 Test, rapid solid phase immuno-chromatographic test.As many as 23 (23%) samples were NS1 positive and 17 (17%) samples were positive for IgM antibodies. Based on the combination of dengue NS1 antigen and IgM antibody test, total of 34 patients (34%) were positive for dengue virus infection.Results of the study suggested that a combination of dengue NS1 antigen and IgM antibody tests would increase the rate of detection of dengue illness. This combination would increase the efficacy and aid in early diagnosis of dengue infection.

Evaluation of an NS1 antigen detection for diagnosis of acute dengue infection in patients with acute febrile illness

2008 ◽  
Vol 60 (4) ◽  
pp. 387-391 ◽  
Author(s):  
Keswadee Lapphra ◽  
Anyarit Sangcharaswichai ◽  
Kulkanya Chokephaibulkit ◽  
Surapee Tiengrim ◽  
Wirongrong Piriyakarnsakul ◽  
...  
Keyword(s):  
Dengue Infection ◽  
Febrile Illness ◽  
Antigen Detection ◽  
Acute Febrile Illness ◽  
Ns1 Antigen

scholarly journals Comparative evaluation of dengue NS1 antigen rapid test and IgM ELISA in a tertiary care hospital in VIMS, Ballari

2021 ◽  
Vol 7 (3) ◽  
pp. 175-178
Author(s):  
Gajendra Varma
Keyword(s):  
Dengue Virus ◽  
Rapid Method ◽  
Dengue Infection ◽  
Rapid Test ◽  
Antigen Detection ◽  
Care Hospital ◽  
Age Group ◽  
Igm Elisa ◽  
Test Kit ◽  
Ns1 Antigen

Dengue virus infection is becoming a major public health problem in recent decades because of the mortality and morbidity associated with it. Dengue is endemic in many parts of India and epidemics are frequently reported from various parts of India and abroad. The mortality rate in patients with dengue hemorrhagic fever (DHF) and dengue shock syndrome (DSS) is as high as 44%. Hence early and rapid laboratory diagnosis of dengue is crucial. Appropriate clinical management can save the lives of DHF and DSS patients and mortality can be reduced to less than 1%. It is also worthwhile for planning appropriate control strategies. The present communication reports the seroprevalence of dengue infections occurred in Central India.To detect Dengue infection by NS1 Antigen Rapid detection and by IgM ELISA and compare Rapid NS1 Antigen detection test and IgM ELISA test.Blood samples from 5273 suspected cases were collected from January 2016 to December 2016. Sera were separated and subjected for NS1 antigen detection testing by the solid phase immunochromatographic assay, a commercial dengue virus rapid test kit. and antidengue IgM antibody ELISA in the Department of Microbiology, VIMS, Ballari. All samples were put for ELISA.3036 samples were tested for NS1 Antigen detection rapid method.2272 samples were tested for both rapid test and ELISA. Out of 5273 cases, 446 (8.46%) were found to be positive by IgM ELISA. 3036 samples WHICH were tested for NS1 Antigen detection by rapid method 208 (6.85%)samples were positive. The most affected age group was 5-10yrs with 284 cases, out of which 29 were positive, followed by the age group 0f 15yrs and above with 8.74%. Males were affected more than females with a percentage of 9.2 and 7.4 respectively. The highest number of suspected dengue patients admitted was in the month of November, i.e., 459 with 68 positive (14.81%) followed by August (12.16%) and September (11.03%), i.e., 28 with 7 (25%) positive. For the 2272 samples for which both tests were done, 153 cases were positive for rapid test and 137 cases were positive by ELISA. Dengue cases were more during September to November in the post monsoon season which is useful to plan special preventive strategies. The study draws attention toward the male, young and adult age group. To conclude, in countries lacking infrastructure for the diagnostic labs especially in the rural and remote areas, the rapid dengue ICT tests can play a major role in diagnosis and in patient management of acute dengue infection. The rapid ICTs are very simple, easy to perform, and can be used as point of care tests. We suggest that the rapid ICT for NS1 Ag detection may be used in patients presenting with fever less than 5 days

scholarly journals Comparison of Seven Commercial Antigen and Antibody Enzyme-Linked Immunosorbent Assays for Detection of Acute Dengue Infection

2012 ◽  
Vol 19 (5) ◽  
pp. 804-810 ◽  
Author(s):  
Stuart D. Blacksell ◽  
Richard G. Jarman ◽  
Robert V. Gibbons ◽  
Ampai Tanganuchitcharnchai ◽  
Mammen P. Mammen ◽  
...  
Keyword(s):  
South Korea ◽  
Dengue Virus ◽  
Dengue Infection ◽  
Virus Antigen ◽  
Enzyme Linked Immunosorbent Assay ◽  
Capture Elisa ◽  
Igm Antibody ◽  
Antigen Elisa ◽  
Ns1 Antigen ◽  
Elisa Format

ABSTRACTSeven commercial assays were evaluated to determine their suitability for the diagnosis of acute dengue infection: (i) the Panbio dengue virus Pan-E NS1 early enzyme-linked immunosorbent assay (ELISA), second generation (Alere, Australia); (ii) the Panbio dengue virus IgM capture ELISA (Alere, Australia); (iii) the Panbio dengue virus IgG capture ELISA (Alere, Australia); (iv) the Standard Diagnostics dengue virus NS1 antigen ELISA (Standard Diagnostics, South Korea); (v) the Standard Diagnostics dengue virus IgM ELISA (Standard Diagnostics, South Korea); (vi) the Standard Diagnostics dengue virus IgG ELISA (Standard Diagnostics, South Korea); and (vii) the Platelia NS1 antigen ELISA (Bio-Rad, France). Samples from 239 Thai patients confirmed to be dengue virus positive and 98 Sri Lankan patients negative for dengue virus infection were tested. The sensitivities and specificities of the NS1 antigen ELISAs ranged from 45 to 57% and 93 to 100% and those of the IgM antibody ELISAs ranged from 85 to 89% and 88 to 100%, respectively. Combining the NS1 antigen and IgM antibody results from the Standard Diagnostics ELISAs gave the best compromise between sensitivity and specificity (87 and 96%, respectively), as well as providing the best sensitivity for patients presenting at different times after fever onset. The Panbio IgG capture ELISA correctly classified 67% of secondary dengue infection cases. This study provides strong evidence of the value of combining dengue virus antigen- and antibody-based test results in the ELISA format for the diagnosis of acute dengue infection.

Incidence and Pattern of Clinical Dengue Cases among Travelers and NonTravelers in a District of Bangladesh

2020 ◽  
Vol 7 (1) ◽  
pp. 3-7
Author(s):  
Syed Abdul Kader ◽  
Sonia Afrin Rob
Keyword(s):  
Endemic Area ◽  
Dengue Infection ◽  
Laboratory Data ◽  
Data Entry ◽  
Cross Sectional Study ◽  
P Value ◽  
College Hospital ◽  
Cross Sectional ◽  
Test Kit ◽  
Ns1 Antigen

Background: Expansion of Dengue fever caused by a mosquito borne arbovirus to new countries and, from urban to rural settings constitutes an important health problem in the world including Bangladesh. Objective: This study was conducted to evaluate spread of clinical Dengue to previously non-endemic Barisal district and get an idea of how recent this spread is by comparing proportions of non-travelers and travelers to an endemic area among the admitted patients. Methodology: The incidence of dengue infection in Barisal division with and without travel history to known endemic area was investigated in the current cross sectional study from a conveniently selected sample of patients admitted to the medicine department of Sher-e-Bangla medical College Hospital form Barisal district from July 15, through August, to September 15, 2019. Clinical and laboratory data were collected by attending doctors and checked by investigators. The primary diagnostic tool was NS1 antigen detected by SD Bioline Dengue NS1 Ag Test Kit. Data entry and analysis was done by SPSS version 24.0 software. Result: A total number of sample size was 212 admitted patents of whom 138(65.1%) were male, 74 (34.9 %) were female,116 (54.7%) of patients traveled to a known endemic zone, 96 (45.3%) did not; 206 (97.2%) were NS1 positive, 4 (1.9%) were IgM positive, 2 (0.9%) were IgM positive and IgG positive; Of travelling 116 patients, 92(79.3%) were male, 24(20.7%) were female, of travelling 96 patients 46(47.9%) were male, 50(52.1%) were female. p-value was <0.001. Conclusion: The study concluded that Dengue is becoming endemic in previously non-endemic zones like greater Barisal, though travelers still holds the major share of disease burden. Male preponderance in traveling to endemic zone was statistically significant. Bangladesh Journal of Infectious Diseases 2020;7(1):3-7

scholarly journals Evaluation of Six Commercial Point-of-Care Tests for Diagnosis of Acute Dengue Infections: the Need for Combining NS1 Antigen and IgM/IgG Antibody Detection To Achieve Acceptable Levels of Accuracy

2011 ◽  
Vol 18 (12) ◽  
pp. 2095-2101 ◽  
Author(s):  
Stuart D. Blacksell ◽  
Richard G. Jarman ◽  
Mark S. Bailey ◽  
Ampai Tanganuchitcharnchai ◽  
Kemajittra Jenjaroen ◽  
...  
Keyword(s):  
Dengue Fever ◽  
Sensitivity And Specificity ◽  
Dengue Infection ◽  
Antibody Test ◽  
Antibody Detection ◽  
Sample Collection ◽  
Igg Antibody ◽  
Igm Antibody ◽  
Ns1 Antigen ◽  
Antibody Tests

ABSTRACTSix assays were evaluated in this study to determine their suitability for the diagnosis of acute dengue infection using samples from 259 Sri Lankan patients with acute fevers (99 confirmed dengue cases and 160 patients with other confirmed acute febrile illnesses): (i) the Merlin dengue fever IgG & IgM combo device (Merlin), (ii) the Standard Diagnostics Dengue Duo nonstructural 1 (NS1) antigen and IgG/IgM combo device (Standard Diagnostics, South Korea), (iii) the Biosynex Immunoquick dengue fever IgG and IgM (Biosynex, France) assay, (iv) the Bio-Rad NS1 antigen strip (Bio-Rad, France), (v) the Panbio Dengue Duo IgG/IgM Cassette (Inverness, Australia), and (vi) the Panbio dengue NS1 antigen strip (Inverness, Australia). The median number of days of fever prior to admission sample collection was 5 days (interquartile range, 3 to 7 days). Sensitivity and specificity of the NS1 antigen tests ranged from 49 to 59% and from 93 to 99%, respectively, and sensitivity and sensitivity of the IgM antibody test ranged from 71 to 80% and from 46 to 90%, respectively. Combining the NS1 antigen and IgM antibody results from the Standard Diagnostics Dengue Duo test gave the best compromise of sensitivity and specificity (93% and 89%, respectively) and provided the best sensitivity in patients presenting at different times after fever onset. The Merlin IgM/IgG antibody tests correctly classified 64% and 86% of the primary and secondary dengue infection cases, respectively, and the Standard Diagnostics IgM/IgG antibody tests correctly classified 71% and 83% of the primary and secondary dengue infection cases, respectively. This study provides strong evidence of the value of combining dengue antigen- and antibody-based test results in the rapid diagnostic test (RDT) format for the acute diagnosis of dengue.

scholarly journals The antibody response in Legionnaires' disease

1979 ◽  
Vol 83 (2) ◽  
pp. 377-381 ◽  
Author(s):  
J. Nagington ◽  
T. G. Wreghitt ◽  
J. O'H. Tobin ◽  
A. D. Macrae
Keyword(s):  
Antibody Response ◽  
Serological Test ◽  
Igg Antibodies ◽  
Immunofluorescence Technique ◽  
Igg Antibody ◽  
Recent Infection ◽  
Igm Antibody ◽  
Serotype 1 ◽  
Indirect Immunofluorescence Technique ◽  
Legionnaires Disease

summaryFrom 22 patients with Legionnaires' disease, 86 sera were examined for specific serotype 1 IgM and IgG antibodies by the indirect immunofluorescence technique.No antibody was detectable until 8 days or more from the onset of symptoms. When produced the amount was widely variable and remained detectable for periods from less than 34 days to more than 1 year.Initially IgM antibody predominated, ten patients produced only IgM in the first 21 days, six produced only IgM in the first 28 days and three did not produce IgG at any time. One patient, and possibly a second, produced only IgG antibody.Since IgM antibody was still present in one patient after a year it is important not to accept the presence of this as evidence of very recent infection.It is advisable that any type of serological test for L. pneumophila infection should detect the production of both IgM and IgG antibodies.

scholarly journals DETEKSI DINI DEMAM BERDARAH DENGUE DENGAN PEMERIKSAAN ANTIGEN NS1

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Mayer F. Wowor
Keyword(s):  
Nucleic Acids ◽  
Acute Phase ◽  
Vaccine Development ◽  
Early Stage ◽  
Serological Test ◽  
Clinical Care ◽  
Dengue Infection ◽  
Diagnostic Methods ◽  
Sample Collection ◽  
Ns1 Antigen

Abstract: Efficient and accurate diagnosis of dengue is of primary importance for clinical care, surveillance activities, outbreak control, pathogenesis, academic research, vaccine development, and clinical trials. Laboratory diagnostic methods for confirming dengue virus infection may involve detection of the viruses, viral nucleic acids, antigens and antibodies, or a combination of these techniques. After the onset of illness, the virus can be detected in serum, plasma, circulating blood cells, and other tissues for 4–5 days. During the early stage of the disease, virus isolation and the detection of viral nucleic acids or antigens, can be used to confirm the diagnosis of dengue infection. NS1 antigen appears as early as day 1 after the onset of fever, and declines to undetectable levels after day 5–6. At the end of the acute phase of infection, a serological test is the method of choice for diagnosis. A range of laboratory diagnostic methods has been developed to support patient management and disease control. The choice of diagnostic method depends on the purpose for which the test is done, available  laboratory facilities and technical expertise, costs, and the time of sample collection. Keywords: laboratory diagnostic methods, acute phase, NS1 antigen     Abstrak: Diagnosis dengue yang efisien dan akurat adalah hal yang paling penting  untuk proses perawatan di klinik, aktivitas surveilens, kontrol penularan penyakit, patogenesis, penelitian akademik, pengembangan vaksin dan percobaan-percobaan klinis. Metode diagnosis laboratorium untuk mengonfirmasi adanya infeksi virus dengue dapat meliputi deteksi virus dengue, asam nukleat virus, antigen dan antibodi, atau kombinasi dari teknik-teknik tersebut. Setelah serangan penyakit, virus dapat dideteksi dalam serum, plasma, sel-sel darah yang bersirkulasi, dan di jaringan lain dalam waktu 4-5 hari. Selama tahap awal dari penyakit, isolasi virus, asam nukleat virus, atau deteksi antigen dapat digunakan untuk diagnosis infeksi. Antigen NS1 muncul pada hari pertama setelah serangan demam dan menurun ke tingkat tidak terdeteksi setelah 5-6 hari. Pada akhir fase akut infeksi, serologi adalah metode pilihan untuk diagnosis. Metode diagnosis laboratorium telah berkembang untuk menunjang penanganan pasien dan kontrol penyakit. Pilihan untuk metode diagnosis bergantung pada tujuan tes dilakukan, fasilitas laboratorium dan tenaga ahli yang tersedia, biaya, dan saat sampel dikumpulkan. Kata kunci: metode diagnosis laboratorium, fase akut, antigen NS1

scholarly journals Utility of rapid diagnostic kit tests for diagnosis of suspected dengue fever

2019 ◽  
Vol 7 (5) ◽  
pp. 1670
Author(s):  
Sarita Otta ◽  
Bichitrananda Swain
Keyword(s):  
Platelet Count ◽  
Dengue Fever ◽  
Rapid Test ◽  
Febrile Illness ◽  
Serum Samples ◽  
Serological Tests ◽  
Ns1 Antigen ◽  
Elisa Technique ◽  
Low Platelet Count ◽  
Sensitivity Specificity

Background: Dengue fever often presents as an undifferentiated febrile illness requiring a laboratory test for identification. Serological tests particularly on rapid kits for the detection of NS1Antigen, IgG and IgM antibodies are the most commonly performed test across the country.Methods: The serum samples of suspected dengue cases were tested by Rapid test kits for assessing all the three parameters as well as by ELISA for NS1 antigen test. The platelet count of the patients was obtained from automated coulter counter. The results thus obtained were analyzed in Excel format.Results: The serum samples from 304 suspected Dengue fever cases were received in the lab, of which 190 samples were positive either by rapid or ELISA and 176 when rapid card test was considered alone Highest seropositivity of dengue cases were observed in the age group of ≥60 years (79.2%) followed by 45-59 years (70.7%). On rapid test, 78 cases were NS1 antigen positive of which 60 cases were positive only for NS1 antigen. When NS1 rapid and ELISA tests when compared, 16 kit negative tests were positive on ELISA while 34 kit positive tests were ELISA negative.  Sensitivity, specificity, PPV and NPV when only NS1 was considered on rapid test kits when compared with ELISA were 78.9%, 87.8%, 63.8% and 93.8%. 33.5% of serologically positive cases of Dengue had low platelet count on admission while only among negative cases 17.2% had a low platelet.Conclusions: Rapid kits often show variable results thus needing a validation of them from end user. As a positive dengue test result is an essential prerequisite for diagnosis thus it is essential that for serological tests ELISA technique should be used for reporting. Thus, it also mandates more efforts at decentralization of NVBDCP to include both government and non government institutions.

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