Covid testing Tag

17 Mar

Posted at 19:09h in Author Interviews, COVID -19 Coronavirus, Dermatology, Lancet
MedicalResearch.com Interview with: [caption id="attachment_56988" align="alignleft" width="200"]matt-spick Matt Spick[/caption] Matt Spick, Post-Graduate Researcher University of Surrey Faculty of Engineering and Physical Sciences Guildford, UK MedicalResearch.com: What is the background for this study? Are you measuring lipids or the virus? Response: In this study, we aimed to detect what the virus does to us, rather than the virus itself. The gold standard for detecting COVID-19 is the RT-PCR test, but by their nature, PCR tests only provide diagnostic information, and at times during the pandemic the availability of PCR tests has been a bottleneck for the identification of the disease. Our goal was to investigate a novel method for the diagnosis of COVID-19, at the same time as learning more about what the disease does to us through lipidomics.

12 Nov

Posted at 17:34h in Author Interviews, COVID -19 Coronavirus, JAMA
MedicalResearch.com Interview with: Brunella Posteranno PhD Associate Professor of Microbiology Department of Medical and Surgical Sciences Rome, Italy MedicalResearch.com: What are the main findings? Response: This study arises from an attempt to clarify some recent evidences of positive real-time PCR (RT-PCR) test results among patients who recovered from COVID-19 with prior negative results. Retesting positive for SARS-CoV-2 RNA, in the absence of any symptoms suggestive of new infection, poses questions regarding not only the SARS-CoV-2 infection course but also, most importantly, the infectivity status of recovered COVID-19 patients. In other words, it is unknown whether such patients are infectious and whether they should be quarantined. Detecting genetic sequences (i.e., RNA) of SARS-CoV-2 in respiratory samples (e.g., nasal/oropharyngeal swab samples) by RT-PCR assays enable us to identify persons suffering from COVID-19 along with those who have been exposed and able to transmit virus to others even if they are asymptomatic. It is not hyperbole to say that without RT-PCR testing an effective fight against the virus would be impossible. However, RT-PCR assays are not a viral culture and do not allow to determine whether the virus is viable and, consequently, transmissible. In this study, we investigated RT-PCR retested positive nasal/oropharyngeal swab (NOS) samples from recovered COVID-19 patients for the presence of replicative SARS-CoV-2 RNA to assess active virus replication. 

06 Nov

Posted at 20:36h in Author Interviews
MedicalResearch.com Interview with: [caption id="attachment_55853" align="alignleft" width="200"]Emily S. Barrett, PhD Rutgers School of Public Health Environmental and Occupational Health Sciences Institute Piscataway, NJ 08854 Dr. Barrett[/caption] Emily S. Barrett, PhD Rutgers School of Public Health Environmental and Occupational Health Sciences Institute Piscataway, NJ 08854  MedicalResearch.com: What is the background for this study? Response: As the covid-19 pandemic hit the us, it became clear that health care workers were potentially at risk and there was great concern for frontline doctors and nurses treating infected patients. With the health and safety of our hospital staff in mind, we offered covid-19 virus and antibody testing to all of the hospital employees.

23 Sep

Posted at 10:55h in Author Interviews, BMJ, COVID -19 Coronavirus
MedicalResearch.com Interview with: Joon Seo Lim, PhD, ELS Clinical Research Center Asan Institute for Life Sciences Asan Medical Center, Songpa-gu Seoul, Republic of Korea MedicalResearch.com: What is the background for this study? Response: The COVID-19 pandemic is continuing to spread at an alarming rate in all parts of the world, and screening individuals based on symptoms (e.g., fever, cough, anosmia) does not seem to be effective in sufficiently curbing the transmission of the disease. This suggests that asymptomatic individuals infected with SARS-CoV-2 may be a driving force of the ongoing pandemic, but empirical evidence on this issue has been lacking because asymptomatic individuals are likely to go unnoticed unless subjected to systematic contact tracing. A large-sized outbreak of COVID-19 from a single religious group in South Korea enabled us to identify and test a large number of asymptomatic individuals with SARS-CoV-2 alongside symptomatic patients from the same cluster. 

09 Sep

Posted at 13:40h in Author Interviews, COVID -19 Coronavirus
MedicalResearch.com Interview with: Claudia Alteri, PhD Assistant Professor (RTD-B) in Microbiology And Clinical Microbiology Department of Oncology and Hemato-Oncology University of Milano  MedicalResearch.com: What is the background for this study? Response: In the context of SARS-CoV-2 diagnosis, laboratories play a critical role in confirming the initial clinical suspicion of this disease, as confirmation of SARS-CoV-2 presence is essential to ensure the prompt initiation of containment and treatment protocols. This is of utmost importance to avoid further spread of the pandemic, and to assure the best clinical and therapeutic management of the infected patients in the hospital setting. Unfortunately, currently used rtPCR assays lack of the necessary sensitivity to identify all cases of SARS-CoV-2 infection (20% of false negative results [Li D et all, Korean J Rad 2020; Zhao et all CID 2020]). Complementary laboratory assays are therefore strongly needed. Droplet Digital PCR (ddPCR) is a highly sensitive assay for the direct detection and quantification of DNA and RNA targets. It has been increasingly used in infectious disease settings, especially thanks to its ability to consistently and reliably detect down to few copies of viral genomes. Standing the necessity of a limitation (as much as possible) of false negative results in COVID-19 diagnosis, the use of ddPCR could provide a critical support. In the context of COVID-19 diagnosis, two recent studies highlight the good performances of ddPCR in detecting low viral load samples (Suo T MedRxiv 2020; You F MedRxiv 2020) 

03 Sep

Posted at 09:57h in Author Interviews, BMJ, COVID -19 Coronavirus
MedicalResearch.com Interview with: corona virus-Covid19Dr. Francesco Venturelli Servizio di Epidemiologia Direzione Sanitaria - Azienda USL-IRCCS di Reggio Emilia Padiglione Ziccardi, Via Amendola MedicalResearch.com: What is the background for this study? Response: Contact tracing and isolation for people testing positive for SARS-CoV-2 are two of the main strategies to limit the viral spread and contain the current pandemic. Long persistence of viral RNA detected by RT-PCR on nasopharyngeal swabs is commonly reported, while its correlation to virus viability is still debated. MedicalResearch.com: What are the main findings?  Response: The study showed that in people with COVID-19, the median time between symptoms onset and viral clearance at RT-PCR was 36 days. Moreover, an overall 20% risk of “false negative” results at RT-PCR was observed, decreasing with time from diagnosis.    

26 Jul

Posted at 12:10h in Author Interviews, COVID -19 Coronavirus
MedicalResearch.com Interview with: [caption id="attachment_54955" align="alignleft" width="142"]Jonathan Li, MD MMSc Assistant Professor of Medicine Harvard Medical School Division of Infectious Diseases Brigham and Women’s Hospital Dr. Jonathan Li[/caption] Jonathan Li, MD MMSc Assistant Professor of Medicine Harvard Medical School Division of Infectious Diseases Brigham and Women’s Hospital  MedicalResearch.com: Why did you do this study? Response: The accurate diagnosis of COVID-19 is critical for our patients in order to receive appropriate care, and for infection control and public health. In the US, the gold standard for COVID diagnosis is sampling through a nasopharyngeal swab (NP)  but is that really the best way to diagnose COVID?  As many of your viewers may have experienced first hand, nasopharyngeal swabs require inserting a long swab into the back of the nose, which is incredibly uncomfortable for the patient, technically-challenging for the health care worker, and requires equipment and reagents that are in short supply. There are also alternative sampling methods for COVID diagnosis. In Asia, oropharyngeal sampling(OP), or swabbing the back of the mouth, are commonly used and in my hospital, the Brigham and Women’s Hospital, we frequently test sputum as well for inpatients.  But there’s a lot of confusion in the field about which of these methods is the most sensitive? We undertook this study to try to bring some clarity to this question of what is the most sensitive way to diagnose COVID and detect SARS-CoV-2?