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10.3389/fcimb.2021.559447

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suck abstract from ncbi


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pmid33816325      Front+Cell+Infect+Microbiol 2021 ; 11 (ä): 559447
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  • Severe Acute Respiratory Syndrome Coronavirus 2 Viral RNA Load Status and Antibody Distribution Among Patients and Asymptomatic Carriers in Central China #MMPMID33816325
  • Yuan Y; Wang H; Zhao J; Jing N; Xu J; Li W; Ma B; Zhang J; Li G; Wang S; Li Y; Wang Y; Fan E; Li L
  • Front Cell Infect Microbiol 2021[]; 11 (ä): 559447 PMID33816325show ga
  • This study aimed to monitor severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) viral loads and specific serum-antibodies (immunoglobulin [Ig] G and M) among confirmed patients and asymptomatic carriers from returning healthy travelers. The throat swabs, sputum, and stool samples from 57 hospitalized coronavirus disease (COVID-19) patients and 8 asymptomatic carriers, among 170 returning healthy travelers were tested using reverse-transcription real-time polymerase chain reaction. SARS-CoV-2 IgM/IgG antibodies were detected via serum chemiluminescence assay. Sequential results showed higher viral RNA loads in the throat, sputum, and stool samples at 3-12 and 6-21 days after symptom onset among severely ill COVID-19 patients. Shorter viral habitation time (1-8 days) was observed in the oropharyngeal site and intestinal tract of asymptomatic carriers. The IgG and IgM response rates were 19/37 (51.4%) and 23/37 (62.6%) among the 29 confirmed patients and 8 asymptomatic carriers, respectively, within 66 days from symptom or detection onset. The median duration between symptom onset and positive IgG and IgM results was 30 (n=23; interquartile range [IQR]=20-66) and 23 (n=19; IQR=12-28) days, respectively. Of 170 returning healthy-travelers to China, 4.7% were asymptomatic carriers (8/170) within 2 weeks, and the IgG and IgM positivity rate was 12.8% (12/94). IgM/IgG-positivity confirmed 3 suspected SARS-CoV-2 cases, despite negative results for SARS-CoV-2 RNA. Compared with other respiratory viral infectious diseases, COVID-19 has fewer asymptomatic carriers, lower antibody response rates, and a longer antibody production duration in recovered patients and the contacted healthy population. This is an indication of the complexity of COVID-19 transmission.
  • |*Asymptomatic Diseases[MESH]
  • |*Viral Load[MESH]
  • |Aged[MESH]
  • |Antibodies, Viral/blood[MESH]
  • |Antibody Formation[MESH]
  • |COVID-19/diagnosis/*epidemiology/*immunology[MESH]
  • |Carrier State[MESH]
  • |Case-Control Studies[MESH]
  • |China/epidemiology[MESH]
  • |Female[MESH]
  • |Humans[MESH]
  • |Immunoglobulin G/blood[MESH]
  • |Immunoglobulin M/blood[MESH]
  • |Male[MESH]
  • |Middle Aged[MESH]
  • |RNA, Viral[MESH]
  • |Retrospective Studies[MESH]
  • |SARS-CoV-2/*immunology/isolation & purification[MESH]


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