Development of a Fast SARS-CoV-2 IgG ELISA, Based on Receptor-Binding Domain, and Its Comparative Evaluation Using Temporally Segregated Samples From RT-PCR Positive Individuals

SARS-CoV-2 antibody detection assays are crucial for gathering seroepidemiological information and monitoring the sustainability of antibody response against the virus. The SARS-CoV-2 Spike protein's receptor-binding domain (RBD) is a very specific target for anti-SARS-CoV-2 antibodies detection. Moreover, many neutralizing antibodies are mapped to this domain, linking antibody response to RBD with neutralizing potential. Detection of IgG antibodies, rather than IgM or total antibodies, against RBD is likely to play a larger role in understanding antibody-mediated protection and vaccine response. Here we describe a rapid and stable RBD-based IgG ELISA test obtained through extensive optimization of the assay components and conditions. The test showed a specificity of 99.79% (95% CI: 98.82-99.99%) in a panel of pre-pandemic samples (n = 470) from different groups, i.e., pregnancy, fever, HCV, HBV, and autoantibodies positive. Test sensitivity was evaluated using sera from SARS-CoV-2 RT-PCR positive individuals (n = 312) and found to be 53.33% (95% CI: 37.87-68.34%), 80.47% (95% CI: 72.53-86.94%), and 88.24% (95% CI: 82.05-92.88%) in panel 1 (days 0-13), panel 2 (days 14-20) and panel 3 (days 21-27), respectively. Higher sensitivity was achieved in symptomatic individuals and reached 92.14% (95% CI: 86.38-96.01%) for panel 3. Our test, with a shorter runtime, showed higher sensitivity than parallelly tested commercial ELISAs for SARS-CoV-2-IgG, i.e., Euroimmun and Zydus, even when equivocal results in the commercial ELISAs were considered positive. None of the tests, which are using different antigens, could detect anti-SARS-CoV-2 IgGs in 10.5% RT-PCR positive individuals by the fourth week, suggesting the lack of IgG response

Knowledge, attitude and practice about eye donation among medical and paramedical students in tertiary eye care hospital

Background: Eye sight is very important for human life. The World Health Organization (WHO) estimates that every 5 seconds someone goes blind. Globally, 37 million people are blind, and of these nearly 10 lakh blind people are willing for corneal transplantation. Aims: The aim of the study was to assess the knowledge, attitude, and practice regarding eye donation among the students. Materials and Methods: The data were collected by the questionnaire method from medical and paramedical students at Al Ameen Medical College, Bijapur. Data collected from the participants were analyzed using percentage and descriptive statistics. Results: Out of the 250 students, 60.4% were Muslim by religion. The participants were wellaware of eye donation (99.2%) quoting media as a major source of information for their knowledge. Attitude regarding eye donation in few (45.6%) was different as it was against their religious belief, although they said it was a service to the mankind (92%). Out of the 250 students, 48% were willing to pledge and 52% students did not believe in pledging their eyes. Conclusion: The findings of the study showed that overall knowledge about eye donation among students was good, however the attitude and practice showed mixed responses

Dexmedetomidine in PRES: An appropriate therapeutic decision

PRES, a reversible white matter lesion characterized by cerebral edema, found in 7–20% of the patients with preeclampsia and eclampsia, needs early diagnosis and therapeutic intervention. We report PRES in a young preeclamptic primigravida and the role of dexmedetomidine in controlling her uncontrollable blood pressure in ICU. Dexmedetomidine, has cerebroprotective cardioprotective and renoprotective properties all of which, helped the patient improving clinically

Microstructure control and wear of Al2O3-SiC-(Al,Si) composites made by melt oxidation

Ceramic matrix composites of Al2O3-SiC-(Al,Si) have been fabricated by directed melt oxidation of aluminum alloys into SiC particulate preforms. The proportions of Al2O3, alloy, and porosity in the composite can be controlled by proper selection of SLC particle size and the processing temperature. The wear resistance of composites was evaluated in pin-on-disk experiments against a hard steel substrate. Minimum wear rate comparable to conventional ceramics such as ZTA is recorded for the composition containing the highest fraction of alloy, owing to the development of a thin and adherent tribofilm with a low coefficient of friction