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2. were 303 participants: 153 instances and 150 settings. ELISA detecting anti-S protein antibody was more sensitive (88.9% for IgG and 86.3% for IgM) than the CLIAs (82.4% for total antibodies and 76.585.6% for IgG). Among CLIAs, Roche IgG was most sensitive K-Ras(G12C) inhibitor 12 (85.6%) followed by Abbott (83%) and Liaison (83%). Abbot experienced the best PPV (88.8%) and was more specific (89.3%) than Liaison (82%) and Roche (82%). Siemens IgG was less sensitive (76.5%) than Siemens Total (82.4%). The specificity of all the serological assays was moderate (7590%). Antibody test positivity increased with the duration of illness reaching 90% after 10 days of illness. When cases were compared against pre-pandemic settings, the IgG offered superb specificity (98100%). For seroprevalence studies, InBios IgG experienced the best accuracy (90.8%) with 88.9% sensitivity and 97.6% specificity. == Summary == The serological assays are important adjuncts for the analysis of COVID-19 in individuals with prolonged symptoms, especially in the second week K-Ras(G12C) inhibitor 12 of illness. The value of serological diagnostic checks is limited in the 1st week of illness and they provide additional value in seroprevalence studies. The diagnostic accuracy of the ELISA and CLIA platforms were similar. Keywords:COVID-19, SARS-CoV-2, Antibody test, IgM, IgG, Serology == Background == The novel coronavirus disease (COVID-19) pandemic poses huge challenges to the already Rabbit polyclonal to KLHL1 stretched health care systems in India and several other countries. In the wake of this highly contagious viral disease, over 398 million people were confirmed to have novel severe acute respiratory syndrome coronavirus (SARS-CoV-2) illness resulting in over 5.5 million deaths worldwide as of Feb 2022 [1]. The large majority of individuals (about 80%) presents with slight disease and recover within a week [2]. They do not require diagnostic evaluation. However, about 15% of individuals develop persisting symptoms progressing to moderate or severe disease with complications including lower respiratory involvement a week after the onset of symptoms [3,4]. Currently, the detection of the SARS-CoV-2 viral RNA by real-time reverse transcriptase-polymerase chain reaction (RT-PCR) remains the gold standard test for the analysis of COVID-19 [5]. However, it is expensive and demands sophisticated laboratory facilities and experience. Further, the level of sensitivity of its results depends on the type and adequacy of sample, sampling technique, time of sample collection in relation to sign onset, and viral weight [6,7]. Serological checks that detect IgM, IgG, IgA or total antibodies against SARS-CoV-2 are cheaper and better to carry out [8]. It has also been founded that seroconversion happens in vast majority of individuals in 1014 days after the onset of symptoms [9]. Hence, among individuals with persisting symptoms, severe disease, or complications, antibody detection may aid in the cost-effective analysis. Serological tests can certainly help in population-based seroprevalence studies also. Many serological assays are commercially obtainable that differ in format (lateral movement immunoassays (LFA), enzyme-linked immunosorbent assays (ELISA) and chemiluminescent immunoassays (CLIA) and SARS-CoV-2 antigen used in assay style (recombinant nucleocapsid proteins (NP), subunit 1 K-Ras(G12C) inhibitor 12 of the spike glycoprotein (S1), the Spike glycoprotein receptor-binding area (RBD), etc. Nevertheless, the function and precision of serologic assays aren’t adequately examined which demands evaluation of every assay to validate their scientific utility. This scholarly research examined the efficiency of serological exams of different platforms that detect IgM, IgG, and total antibodies against SARS-CoV-2 antigens by testing well-characterized COVID-19 control and cases. == Components and.