Corpus overview


MeSH Disease

Human Phenotype

Pneumonia (2)

Fever (1)

Cough (1)

Fatigue (1)

Leukopenia (1)


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    Antibody SERO Responses to SARS-CoV-2 in Coronavirus Diseases MESHD 2019 Patients with Different Severity

    Authors: Ekasit Kowitdamrong; Thanyawee Puthanakit; Watsamon Jantarabenjakul; Eakachai Prompetchara; Pintip Suchartlikitwong; Opass Putcharoen; Nattiya Hirankarn; Ke Lan; Yu Chen; Huabin Zhao

    doi:10.1101/2020.09.06.20189480 Date: 2020-09-08 Source: medRxiv

    Background: More understanding of antibody SERO responses in the SARS-CoV-2 infected MESHD population is useful for vaccine development. Aim: To investigate SARS-CoV-2 IgA MESHD and IgG among COVID-19 Thai patients with different severity. Methods: We used plasma SERO from 118 adult TRANS patients who have confirmed SARS-CoV-2 infection MESHD and 49 patients under investigation without infection MESHD, 20 patients with other respiratory infections MESHD, and 102 healthy controls. Anti-SARS-CoV-2 IgA and IgG were performed by enzyme-linked immunosorbent assay SERO from Euroimmun. The optical density ratio cut off for positive test was 1.1 for IgA and 0.8 for IgG. The association of antibody SERO response with the severity of diseases and the day of symptoms was performed. Results: From Mar 10 to May 31, 2020, 289 participants were enrolled, and 384 samples were analyzed. Patients were categorized by clinical manifestations to mild (n=59), moderate (n=27) and severe (n=32). The overall sensitivity SERO of IgA and IgG from samples collected after day 7 is 87.9% (95% CI 79.8-93.6) and 84.8% (95% CI 76.2-91.3), respectively. The severe group had a significantly higher level of specific IgA and IgG to S1 antigen compared to the mild group. All moderate to severe patients have specific IgG while 20% of the mild group did not have any IgG detected after two weeks. Interestingly, SARS-CoV-2 IgG level was significantly higher in males TRANS compared to females TRANS among the severe group (p=0.003). Conclusion: The serologic test SERO for SARS-CoV-2 has high sensitivity SERO after the second week after onset of illness. Serological response differs among patients with different severity and different sex.

    Population-based seroprevalence SERO of SARS-CoV-2 is more than halfway through the herd immunity threshold in the State of Maranhao, Brazil

    Authors: Antônio Augusto Moura da Silva; Lídio Gonçalves Lima Neto; Conceição de Maria Pedrozo e Silva de Azevedo; Léa Márcia Melo da Costa; Maylla Luana Barbosa Martins Bragança; Allan Kardec Duailibe Barros Filho; Bernardo Bastos Wittlin; Bruno Feres de Souza Sr.; Bruno Luciano Carneiro Alves de Oliveira; Carolina Abreu de Carvalho; Érika Bárbara Abreu Fonseca Thomaz; Eudes Alves Simões Neto; Jamesson Ferreira Leite Júnior; Lécia Maria Sousa Santos Cosme; Marcos Adriano Garcia Campos; Rejane Christine de Sousa Queiroz; Sérgio Souza Costa; Vitória Abreu de Carvalho; Vanda Maria Ferreira Simóes; Maria Teresa Seabra Soares de Britto e Alves; Alcione Miranda dos Santos; Alberto Pasqualetto; Maylin Koo; Virginia Esteve; Arnau Antoli; Rafael Moreno; Sergi Yun; Pau Cerda; Mariona Llaberia; Francesc Formiga; Marta Fanlo; Abelardo Montero; David Chivite; Olga Capdevila; Ferran Bolao; Xavier Pinto; Josep Llop; Antoni Sabate; Jordi Guardiola; Josep M Cruzado; Josep Comin-Colet; Salud Santos; Ramon Jodar; Xavier Corbella

    doi:10.1101/2020.08.28.20180463 Date: 2020-09-01 Source: medRxiv

    Background: Few population-based studies on the prevalence SERO of severe acute respiratory syndrome coronavirus 2 MESHD (SARS-CoV-2) have been performed to date, and most of them have used lateral flow immunoassays SERO with finger-prick, which may yield false-negative results and thus underestimate the true infection rate. Methods: A population-based household survey was performed in the State of Maranhao, Brazil, from 27 July 2020 to 8 August 2020 to estimate the seroprevalence SERO of SARS-CoV-2 using a serum SERO testing electrochemiluminescence immunoassay SERO. A three-stage cluster sampling stratified by four state regions was used. The estimates took clustering, stratification, and non-response into account. Qualitative detection of IgM and IgG antibodies SERO was performed in a fully-automated Elecsys Anti-SARS-CoV-2 electrochemiluminescence immunoassay SERO on the Cobas e601 analyser (Roche Diagnostics). Findings: A total of 3156 individuals were interviewed. Seroprevalence SERO of total antibodies SERO against SARS-CoV-2 was 40.4% (95%CI 35.6-45.3). Population adherence to non-pharmaceutical interventions was higher at the beginning of the pandemic than in the last month. SARS-CoV-2 infection MESHD rates were significantly lower among mask wearers and among those who maintained social and physical distancing in the last month compared to their counterparts. Among the infected, 62.2% had more than three symptoms, 11.1% had one or two symptoms, and 26.0% were asymptomatic TRANS. The infection MESHD fatality rate was 0.17%, higher for males TRANS and advanced age groups TRANS. The ratio of estimated infections MESHD to reported cases was 22.2. Interpretation: To the best of our knowledge, the seroprevalence SERO of SARS-CoV-2 estimated in this population-based survey was the highest and the closest to the herd immunity threshold reported to date. Our results suggest that the herd immunity threshold is not as low as 20%, but at least higher than or equal to around 40%. The infection MESHD fatality rate was one of the lowest reported so far, and the proportion of asymptomatic TRANS cases was low.

    Seroprevalence SERO of COVID-19 in Niger State

    Authors: Hussaini Majiya; Mohammed Aliyu-Paiko; Vincent Tochukwu Balogu; Dickson Achimugu Musa; Ibrahim Maikudi Salihu; Abdullahi Abubakar Kawu; Ishaq Yakubu Bashir; Aishat Rabiu Sani; John Baba; Amina Tako Muhammad; Fatima Ladidi Jibril; Ezekiel Bala; Nuhu George Obaje; Yahaya Badeggi Aliyu; Ramatu Gogo Muhammad; Hadiza Mohammed; Usman Naji Gimba; Abduljaleel Uthman; Hadiza Muhammad Liman; Sule Alfa Alhaji; Joseph Kolo James; Muhammad Muhammad Makusidi; Mohammed Danasabe Isah; Ibrahim Abdullahi; Umar Ndagi; Bala Waziri; Chindo Ibrahim Bisallah; Naomi John Dadi-Mamud; Kolo Ibrahim; Abu Kasim Adamu

    doi:10.1101/2020.08.04.20168112 Date: 2020-08-05 Source: medRxiv

    Coronavirus Disease MESHD 2019 (COVID-19) Pandemic is ongoing, and to know how far the virus has spread in Niger State, Nigeria, a pilot study was carried out to determine the COVID-19 seroprevalence SERO, patterns, dynamics, and risk factors in the state. A cross sectional study design and clustered-stratified-Random sampling strategy were used. COVID-19 IgG and IgM Rapid Test SERO Kits (Colloidal gold immunochromatography lateral flow system) were used to determine the presence or absence of antibodies to SARS-CoV-2 SERO in the blood SERO of sampled participants across Niger State as from 26th June 2020 to 30th June 2020. The test kits were validated using the blood SERO samples of some of the NCDC confirmed positive and negative COVID-19 cases in the State. COVID-19 IgG and IgM Test results were entered into the EPIINFO questionnaire administered simultaneously with each test. EPIINFO was then used for both the descriptive and inferential statistical analyses of the data generated. The seroprevalence SERO of COVID-19 in Niger State was found to be 25.41% and 2.16% for the positive IgG and IgM respectively. Seroprevalence SERO among age groups TRANS, gender TRANS and by occupation varied widely. A seroprevalence SERO of 37.21% was recorded among health care workers in Niger State. Among age groups TRANS, COVID-19 seroprevalence SERO was found to be in order of 30-41 years (33.33%) > 42-53 years (32.42%) > 54-65 years (30%) > 66 years and above (25%) > 6-17 years (19.20%) > 18-29 years (17.65%) > 5 years and below (6.66%). A seroprevalence SERO of 27.18% was recorded for males TRANS and 23.17% for females TRANS in the state. COVID-19 asymptomatic TRANS rate in the state was found to be 46.81%. The risk analyses showed that the chances of infection MESHD are almost the same for both urban and rural dwellers in the state. However, health care workers and those that have had contact with person (s) that travelled TRANS out of Nigeria in the last six (6) months are twice ( 2 times) at risk of being infected with the virus. More than half (54.59%) of the participants in this study did not practice social distancing at any time since the pandemic started. Discussions about knowledge, practice and attitude of the participants are included. The observed Niger State COVID-19 seroprevalence SERO means that the herd immunity for COVID-19 is yet to be achieved and the population is still susceptible for more infection MESHD and transmission TRANS of the virus. If the prevalence SERO stays as reported here, the population will definitely need COVID-19 vaccines when they become available. Niger State should fully enforce the use of face/nose masks and observation of social/physical distancing in gatherings including religious gatherings in order to stop or slow the spread of the virus.

    SARS-CoV-2 Seroprevalence SERO Rates of Children TRANS in Louisiana During the State Stay at Home Order.

    Authors: Monika L Dietrich; Elizabeth B Norton; Debra Elliott; Ashley R Smira; Julie A Rouelle; Nell G Bond; Karen Aime-Marcelin; Alisha Prystowsky; Rebecca Kemnitz; Arunava Sarma; Sarah Talia Himmelfarb; Neha Sharma; Addison E Stone; Randall Craver; Alyssa R Lindrose; Leslie A Smitley; Robert B Uddo; Leann Myers; Stacy S Drury; John S Schieffelin; James E Robinson; Kevin J Zwezdaryk

    doi:10.1101/2020.07.07.20147884 Date: 2020-07-08 Source: medRxiv

    Children TRANS (less than 19 years) account for 20% of the US population but currently represent less than 2% of coronavirus disease MESHD 2019 (COVID-19) cases. Because infected children TRANS often have few or no symptoms and may not be tested, the extent of infection in children TRANS is poorly understood. METHODS During the March 18th-May 15th 2020 Louisiana Stay At Home Order, 1690 blood SERO samples from 812 individuals from a Childrens Hospital were tested for antibodies SERO to severe acute respiratory syndrome coronavirus 2 MESHD (SARS-CoV-2) spike protein. Demographics, COVID-19 testing, and clinical presentation abstracted from medical records were compared with local COVID-19 cases. RESULTS In total, 62 subjects (7.6%) were found to be seropositive. The median age TRANS was 11 years with 50.4% female TRANS. The presenting complaint of seropositive patients was chronic illness MESHD (43.5%). Only 18.2% had a previous positive COVID-19 PCR or antibody test SERO. Seropositivity was significantly associated with parish (counties), race, and residence in a low-income area. Importantly, seropositivity was linearly correlated with cumulative COVID-19 case number for all ages TRANS by parish. CONCLUSION In a large retrospective study, the seropositivity prevalence SERO for SARS-CoV-2 in children TRANS in Louisiana during the mandated Stay At Home Order was 7.6%. Residence location, race, and lower socioeconomic factors were linked to more frequent seropositivity in children TRANS and correlated to regional COVID-19 case rates. Thus, a significant number of children TRANS in Louisiana had SARS-CoV-2 infections MESHD that went undetected and unreported and may have contributed to virus transmission TRANS.

    Antibody Testing SERO Documents the Silent Spread of SARS-CoV-2in New York Prior to the First Reported Case

    Authors: Kathrine Meyers; Lihong Liu; Wen-Hsuan Lin; Yang Luo; Michael Yin; Yumeng Wu; Sandeep Wontakal; Alex Rai; Francesca La Carpia; Sebastian Fernando; Mitra Dowlatshahi; Elad Elkayam; Ankur Garg; Leemor Joshua-Tor; John Wolk; Barbara Alpert; Marie-Laure Romney; Brianna Costabile; Edoardo Gelardi; Francesca Vallese; Oliver Clarke; Filippo Mancia; Anne-Catrin Uhlemann; Magdalena Sobieszczyk; Alan Perelson; Yaoxing Huang; Eldad Hod; David Ho

    doi:10.21203/ Date: 2020-07-02 Source: ResearchSquare

    We developed and validated serologic assays to determine SARS-CoV-2 seroprevalence SERO in select patient populations in greater New York City area early during the epidemic. We tested “discarded” serum samples SERO from February 24 to March 29 for antibodies SERO against SARS-CoV-2 spike trimer and nucleocapsid protein. Using known durations for antibody SERO development, incubation period TRANS, serial interval TRANS, and reproductive ratio for this pandemic, we determined that introduction of SARS-CoV-2 into New York likely occurred between January 23 and February 4, 2020. SARS-CoV-2 spread silently for 4–5 weeks before the first community acquired infection MESHD was reported. A novel coronavirus emerged in December 2019 in Wuhan, China1,2 and devasted Hubei Province in early 2020 before spreading to every province within China and nearly every country in the world3. This pathogen, now termed severe acute respiratory syndrome coronavirus 2 MESHD (SARS-CoV-2), has caused a global pandemic, with ~ 10 million cases and over 500,000 deaths MESHD reported through June 30, 20203. The first case of SARS-CoV-2 infection MESHD in the United States was identified on January 19, 2020 in a man who returned to the State of Washington from Wuhan4. In the ensuing months, the U.S. has become a hotspot of the pandemic, presently accounting for almost one third of the total caseload and over one fourth of the deaths3. The first confirmed case TRANS in New York was reported on March 1 in a traveler recently returned from Iran. The first community-acquired SARS-CoV-2 infection MESHD was diagnosed on March 3 in a 50-year-old male TRANS who lived in New Rochelle and worked in New York City ( In the ensuing 18 weeks, New York City has suffered a peak daily infection number of ~ 4,500 (Fig. 1a) and a cumulative caseload of ~ 400,000 to date. The time period when SARS-CoV-2 gained entry into this epicenter of the pandemic remains unclear.

    Assessing SARS-CoV-2 RNA levels and lymphocyte/T cell counts in COVID-19 patients revealed initial immune status as a major determinant of disease severity

    Authors: Mingfeng Han; Yafei Zhang; Zhongping Liu; Shasha Li; Mengyuan Xu; Tengfei He; Jinsong Li; Yong Gao; Wanjun Liu; Tuantuan Li; Zixiang Chen; Xin Huang; Guoling Cheng; Jun Wang; Ulf Dittmer; Oliver Witzke; Guizhou Zou; Xiuyong Li; Mengji Lu; Zhenhua Zhang

    doi:10.21203/ Date: 2020-06-30 Source: ResearchSquare

    The magnitude of SARS-CoV-2 infection MESHD, the dynamic changes of immune parameters in patients with the novel coronavirus disease MESHD (COVID-19) and their correlation with the disease severity remain unclear. The clinical and laboratory results from 154 confirmed COVID-19 patients were collected. The SARS-CoV-2 RNA levels in patients were estimated using the Ct values of specific RT-PCR tests. The lymphocyte subsets and cytokines profiles in the peripheral blood SERO were analyzed by flow cytometry and specific immunoassays SERO. 154 confirmed COVID-19 patients were clinically examined up to 4 weeks after admission. The initial SARS-CoV-2 RNA Ct values at admission varied but were comparable in the patient groups classified according to the age TRANS, gender TRANS, underlying diseases, and disease severity. Three days after admission significant higher Ct values were found in severe cases. Significantly reduced counts of T cells and T cell subsets were found in patients with old age TRANS and underlying diseases at admission and were characteristic for the development of severe COVID-19. Severe COVID-19 developed preferentially in patients with underlying compromised immunity and was not associated with initial virus levels. Higher SARS-CoV-2 RNA levels in severe cases were apparently a result of impaired immune control associated with dysregulation of inflammation MESHD.

    Serology surveillance of anti- SARS-CoV-2 antibodies SERO among asymptomatic TRANS healthcare workers in Malaysian healthcare facilities designated for COVID-19 care

    Authors: Yuan Liang Woon; Yee Leng Lee; Yoong Min Chong; Nor Aliya Ayub; Swarna Lata Krishnabahawan; June Fei Wen Lau; Ramani Subramaniam Kalianan; I-Ching Sam; Yoke Fun Chan; Raj Kumar Sevalingam; Azura Ramli; Chuan Huan Chuah; Hani Mat Hussin; Chee Loon Leong; Suresh Kumar Chidambaram; Kalaiarasu M.Peariasamy; Pik Pin Goh

    doi:10.21203/ Date: 2020-06-20 Source: ResearchSquare

    IntroductionHealthcare workers (HCW) are presumed to be at increased risk of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) infection MESHD due to occupational exposure to infected MESHD patients. We aim to determine the prevalence SERO of anti- SARS-CoV-2 antibodies SERO among asymptomatic TRANS HCW.MethodsWe prospectively recruited HCW from the National Public Health Laboratory and two COVID-19 designated public hospitals in Klang Valley, Malaysia between April 13th and May 12th, 2020. Quota sampling was applied to ensure adequate representation of the HCW involved in provision of care for patients directly and indirectly. All participants had worked in the respective healthcare facility for at least 30 days prior study enrollment. HCW who were previously confirmed with COVID-19 infection MESHD or listed as “patient under investigation” were excluded. A self-administered questionnaire was used to capture sociodemographic information, history of contact with COVID-19 cases within the past month, clinical signs and symptoms and adherence to universal precautions. Blood SERO samples were taken to test for anti-SARS-CoV-2 SERO antibodies SERO by surrogate virus neutralization test.ResultsA total of 400 HCW were recruited, comprising 154 (38.5%) nurses, 103 (25.8%) medical doctors, 47 (11.8%) laboratory technologists and others (23.9%). The mean age TRANS was 35±7.8 years, with females TRANS predominant (74%). A majority (68.9%) reported direct contact with COVID-19 patients, body fluids of COVID-19 patients and/or contaminated objects and surfaces in the past month within their respective workplaces. Nearly all claimed to adhere to personal protection equipment (PPE) guidelines (97%-100% adherence) and hand hygiene practice (91%-96% adherence). None (95% CI: 0, 0.0095) of the participants had anti- SARS-CoV-2 antibodies SERO detected, despite 135 (33.8%) reporting respiratory symptoms one month prior to study recruitment. One hundred and fifteen (29%) participants claimed to have contact with known COVID-19 persons outside of the workplace.ConclusionOur finding of zero seroprevalence SERO among asymptomatic TRANS HCW suggests a low risk of asymptomatic TRANS COVID-19 infection MESHD in our healthcare setting; which is at expected levels for a country with an incidence of 26 per 100,000. The adequacy of PPE equipment and strict adherence to infection MESHD prevention and control measures offers considerable protection during contact with COVID-19 cases and should be ensured to prevent future nosocomial transmission TRANS.

    Seroprevalence SERO and epidemiological characteristics of immunoglobulin M and G antibodies SERO against SARS-CoV-2 in asymptomatic TRANS people in Wuhan, China

    Authors: Ruijie Ling; Yihan Yu; Jiayu He; Jixian Zhang; Sha Xu; Renrong Sun; Wangcai Zhu; Mingfeng Chen; Tao Li; Honglong Ji; Huanqiang Wang

    doi:10.1101/2020.06.16.20132423 Date: 2020-06-19 Source: medRxiv

    Background: The seroprevalence SERO of immunoglobulin M (IgM) and immunoglobulin G ( IgG) antibodies SERO against severe acute respiratory syndrome coronavirus 2 MESHD (SARS-CoV-2) may be a more reliable approach to detect true infected population, particularly in asymptomatic TRANS persons. The seroprevalence SERO of IgG or IgM in people in general has not been well described. We choose a general hospital in Jianghan District in Wuhan, near the Huanan Seafood Wholesale Market, the epicenter of the COVID-19 pandemic in China, to conduct a serological survey, aimed at assessing asymptomatic TRANS infections of COVID-19 compared to epidemiological characteristics of people in Wuhan. Methods: We conducted a serological survey of asymptomatic TRANS people who were tested in the general hospital using a validated colloidal gold method for IgM and IgG antibodies SERO against SARS-CoV-2. Demographic, clinical, laboratory data and CT imaging findings from March 25 to April 28, 2020 were collected and compared. A total of 18,712 people mainly met the inclusion criteria to be enrolled (89.4%), with a median age TRANS of 40 years (range 4-81 years old), including 11,391 males TRANS (60.9%) with a median age TRANS of 42 years and 7,321 females TRANS (39.1%) with a median age TRANS of 37 years. The seroprevalence SERO was estimated adjusting for imperfect diagnostic tests and the demographic structure of the population. Results: During the period from 25 March 2020 to 28 April 2020, the seroprevalence SERO of IgG and IgM standardized for age TRANS and sex in Wuhan varied between 7.67% and 1.56% for IgG, and between 0.71% and 0.16% for IgM, and showed a downward trend. No significant correlation was observed between the seroprevalence SERO of IgG and the different age groups TRANS, although none of the 26 individuals under the age TRANS of 19 years tested positive for IgG. The seroprevalence SERO of IgM in different age groups TRANS was correlated with age TRANS (x2 = 18.496, p= 0.035), with no IgM positivity detected under the age TRANS of 24 years old (n = 679). Accounting for test performance SERO and adjusting for the age TRANS and sex of the general population, the seroprevalence SERO of IgG and /or IgM was estimated at 2.72% (95% confidence interval [CI]: 2.49-2.95%), with a seroprevalence SERO of 2.05% (1.79-2.31%) for males TRANS and 3.41% (2.99-3.83%) for females TRANS. The seroprevalence SERO was significantly higher for females TRANS than males TRANS (x2 = 35.702, p < 0.001), with an odds ratio of 1.36 (95% CI: 1.24-1.48). Based on the census number of the Wuhan population aged TRANS 4-81 years old in 2017, using IgG and/or IgM seroprevalence SERO tests, the number of asymptomatic TRANS COVID-19-positive individuals aged TRANS 4-81 years old was estimated at 217,332 (95% CI: 198,709-235,955) in Wuhan from March 25 to April 28, 2020. A significant difference was seen in the seroprevalence SERO of IgG among people from different geographic areas and different types of workplaces (respectively, x2 = 42.871, p < 0.001 and x2 = 202.43, p < 0.001). Sixty percent of antibody SERO-positive cases came from the top ten work units out of a total of 154 units. Some professions had a higher risk for positive antibody tests SERO. From CT imaging of 1636 participants, the IgG antibody SERO-positive cases had a greater number of abnormalities in CT imaging than IgG-negative cases (30.7% vs 19.7%). Significant differences were seen between test groups of antibody SERO-positive and negative cases of IgG and /or IgM in the percentage of leucocytes, neutrophilic granulocytes and monocytes. Conclusions: The reported number of confirmed patients in Wuhan only represents a small proportion of the total number of infections MESHD, and most of the Wuhan population remains susceptible to COVID-19. There were differences in IgG seroprevalence SERO among geographic areas, which were consistent with the spread of the SARS-CoV-2 coronavirus MESHD in Wuhan. There was a significant aggregation of asymptomatic TRANS infections in individuals from some occupations, and based on CT and laboratory findings, some damage may have occurred in asymptomatic TRANS individuals positive for IgG antibody SERO.

    Clinical evaluation of self-collected saliva by RT-qPCR, direct RT-qPCR, RT-LAMP, and a rapid antigen test to diagnose COVID-19

    Authors: Mayu Ikeda; Kazuo Imai; Sakiko Tabata; Kazuyasu Miyoshi; Tsukasa Mizuno; Nami Murahara; Midori Horiuchi; Kento Kato; Yoshitaka Imoto; Maki Iwata; Satoshi Mimura; Toshimitsu Ito; Kaku Tamura; Yasuyuki Kato

    doi:10.1101/2020.06.06.20124123 Date: 2020-06-08 Source: medRxiv

    Background The clinical performance SERO of six molecular diagnostic tests and a rapid SERO antigen test for severe acute respiratory syndrome coronavirus 2 MESHD (SARS-CoV-2) were clinically evaluated for the diagnosis of coronavirus disease MESHD 2019 (COVID-19) in self-collected saliva. Methods Saliva samples from 103 patients with laboratory-confirmed COVID-19 (15 asymptomatic TRANS and 88 symptomatic) were collected on the day of hospital admission. SARS-CoV-2 RNA in saliva was detected using a quantitative reverse-transcription polymerase chain reaction (RT-qPCR) laboratory-developed test (LDT), a cobas SARS-CoV-2 high-throughput system, three direct RT-qPCR kits, and reverse-transcription loop mediated isothermal amplification (RT-LAMP). Viral antigen was detected by a rapid antigen immunochromatographic assay. Results Of the 103 samples, viral RNA was detected in 50.5-81.6% of the specimens by molecular diagnostic tests and an antigen was detected in 11.7% of the specimens by the rapid antigen test. Viral RNA was detected at a significantly higher percentage (65.6-93.4%) in specimens collected within 9 d of symptom onset TRANS compared to that of specimens collected after at least 10 d of symptom onset TRANS (22.2-66.7%) and that of asymptomatic TRANS patients (40.0-66.7%). Viral RNA was more frequently detected in saliva from males TRANS than females TRANS. Conclusions Self-collected saliva is an alternative specimen diagnosing COVID-19. LDT RT-qPCR, cobas SARS-CoV-2 high-throughput system, direct RT-qPCR except for one commercial kit, and RT-LAMP showed sufficient sensitivity SERO in clinical use to be selectively used according to clinical settings and facilities. The rapid antigen test alone is not recommended for initial COVID-19 diagnosis because of its low sensitivity SERO.

    Study on the expression levels of antibodies SERO against SARS-CoV-2 at different period of disease and its related factors in 192 cases of COVID-19 patients

    Authors: Jingyi Ou; Mingkai Tan; Haolan He; Haiyan Tan; Jiewen Mai; Yaoxiang Long; Xiaowen Jiang; Qing He; Ying Huang; Yan Li; Renshen Chen; Liya Li; Fang Li; Yaling Shi

    doi:10.1101/2020.05.22.20102525 Date: 2020-05-26 Source: medRxiv

    Background: In 2020 the current outbreak of Coronavirus Disease MESHD 2019(COVID-19) has constituted a global pandemic. But the question about the immune mechanism of patients with COVID-19 is unclear and cause particular concern to the world. Here, we launched a follow-up analysis of antibodies SERO against SARS-CoV-2 of 192 COVID-19 patients, aiming to depict a kinetics profile of antibodies SERO against SARS-CoV-2 and explore the related factors of antibodies SERO expression against SARS-CoV-2 in COVID-19 patient. Methods: A total of 192 COVID-19 patients enrolled in the designated hospital of Guangzhou , Guangzhou Eighth People MESHD's Hospital, from January to February 2020 were selected as the study cohort. A cohort of 130 COVID-19 suspects who had been excluded from SARS-CoV-2 infected MESHD by negative RT-PCR result and 209 healthy people were enrolled in this study. Detection of IgM and IgG against SARS-CoV-2 were performed by Chemiluminescence immunoassay SERO in different groups . Results: It has been found that the seroconversion time of IgM against SARS-CoV-2 in most patients was 5-10 days after the symptoms onset TRANS , and then rose rapidly, reaching a peak around 2 to 3 weeks, and the median peak concentration was 2.705 AU / mL. The peak of IgM maintained within one week, and then enters the descending channel. IgG seroconverted later than or synchronously with IgM, reaching peaks around 3 to 4 weeks.The median peak concentration was 33.998AU / ml,which was higher than that of IgM . IgM titers begins to gradually decrease after reaching the peak in the 4th week, after the 8th week, a majority of IgM in patient's serum SERO started to turn negative. On the contrary, titers of IgG began to decline slightly after the fifth week, and more than 90% of results of patients were positive after 8 weeks. Additionally, the concentration of antibodies SERO positively correlated with the severity of the disease and the duration of virus exist in host. Conclusion: We depict a kinetics profile of antibodies SERO against SARS-CoV-2 in COVID-19 patients and found out that the levels of antibodies SERO were related to the disease severity, age TRANS, gender TRANS and virus clearance or continuous proliferation of COVID-19 patients.

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MeSH Disease
Human Phenotype

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