View clinical trials related to Covid19.
Filter by:This is randomized, blinded and controlled design. Among the randomly selected subjects who have been vaccinated with two doses of Inactivated COVID-19 vaccine (Vero cell), based on a step-wise approach, the subjects will receive one dose of recombinant COVID-19 vaccine sequentially at different shedules of 4-6 months, 7-9 months and >9 months after two doses of vaccination, and the subjects vaccinated at different schedules will be randomly assigned to different sequential immunization groups. At the same time, each sequential immunization group will be matched with a control group with the inactivated COVID-19 vaccine (vero cells) as the booster dose.
The educational process of general surgery residents is a very important step in every surgeon's career, which is often overlooked or neglected. The Covid-19 pandemic has inflicted deep changes in the medical activity in general and in the training process of young doctors in particular. Our study aims to assess the impact of the Covid-19 pandemic on the educational process of general surgery residents, through a comparative study. The responses of resident doctors at a questionnaire, in two different time periods, will be compared: pre-Covid era (December 2019) and Covid era (December 2020).
This is a implementation research study of a surgical wound tele-monitoring online tool developed at the University of Edinburgh and demonstrated in the "Tracking wound infection with smartphone technology" (TWIST) randomised control trial (NCT02704897) conducted in NHS Lothian. The study design is based on the Medical Research Council (MRC) "Guidance for developing and evaluating complex interventions".
This is a longitudinal study of participants from two university communities in Chile. The primary objective is to examine the effect of a regional lockdown on alcohol and tobacco use, using a difference-in-difference analysis to obtain causal estimates of these COVID-19 policies.
Arterial thrombosis and unusual patterns of thrombotic events in young adults patients with COVID-19 are yet rarely described in this setting and could be underestimated. There is a real need for studies to describe the frequency of unusual thrombotic complications.
The investigators used a retrospective review of 251 SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2) positive patients' cesarean section anesthesia to determine the rate of failed spinal anesthesia, management techniques for failed block, and risk factors that contribute to failure in this study.
The 2019-coronavirus disease (COVID-19), caused by SARS-CoV-2, was identified as the source of pneumonia cases in Wuhan city in China. It rapidly spread worldwide and was declared by WHO as a pandemic. COVID-19 vaccines are expected to be the breakthrough in controlling the pandemic. However, studies performed only in healthy adults, and specifically excluded patients who were under immunomodulatory/biologic therapy, thus excluding patients with chronic inflammatory diseases (IBD). In this study we wish to understand vaccine efficacy and immunological response in IBD patients.
The purpose of this study is to evaluate the efficacy, safety and immunogenicity of GX-19N in healthy individuals who have received one of COVID-19 vaccine authorized for emergency use.
Part 1: An open label, dose and age escalation phase to evaluate the safety and immunogenicity of VXA-CoV2-1.1-S with a repeat-dose vaccination schedule in healthy adults aged 18 - 75 years old that are either vaccine naive or have received prior vaccination with an mRNA (messenger ribonucleic acid) vaccine for the prevention of COVID-19. Part 2: This phase will assess the efficacy of prophylactic VXA-CoV2-1.1-S against confirmed COVID-19 occurring from 7 days after second dose with a repeat-dose vaccination schedule in healthy adults compared to placebo. Safety and immunogenicity of VXA-CoV2-1.1-S will also be evaluated in this phase.
This study will evaluate the correlation between the symptomaticity, Ct value, laboratory biomarkers associated to COVID-19 and the disease progression in hospitalized patients and outpatients with SARS-CoV2 infection diagnosed by RT-PCR assay for nasopharyngeal swab specimens in a specialized laboratory at Medellin,Colombia.