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How many asymptomatic cases were unconfirmed in the US COVID-19 pandemic? The evidence from a serological survey.
Chaos Solitons Fractals
November 2022
School of Management, Shanghai University, Shanghai 200444, China.
A serological survey from CDC revealed more than 10% of individuals in America probably resolving or past infection with SARS-CoV-2 at the end of 2020, which illustrated there were massive unconfirmed asymptomatic infected people by contrast with the reported cases numbers. Asymptomatic patients as one of the crucial reasons for the COVID-19 pandemic being tough to contain, estimating the number of unconfirmed ones including the active infected and having cured in this population, is of great guiding significance for formulating epidemic prevention and control policies. This paper proposes a varying coefficient Susceptible-Infected-Removed-Susceptible (vSIRS) model to obtain the time series data of the unconfirmed asymptomatic infected numbers.
View Article and Find Full Text PDFA data-driven model for COVID-19 pandemic - Evolution of the attack rate and prognosis for Brazil.
Chaos Solitons Fractals
November 2021
Departamento de Física and I3N, Universidade de Aveiro, 3880 Aveiro - Portugal.
We introduce a compartmental model SEIAHRV (Susceptible, Exposed, Infected, Asymptomatic, Hospitalized, Recovered, Vaccinated) with age structure for the spread of the SARAS-CoV virus. In order to model current different vaccines we use compartments for individuals vaccinated with one and two doses without vaccine failure and a compartment for vaccinated individual with vaccine failure. The model allows to consider any number of different vaccines with different efficacies and delays between doses.
View Article and Find Full Text PDFBiochemical composition, transmission and diagnosis of SARS-CoV-2.
Biosci Rep
August 2021
School of Biosciences, Apeejay Stya University, Gurugram 122103, India.
Coronavirus disease 2019 (COVID-19) is a life-threatening respiratory infection caused by severe acute respiratory syndrome virus (SARS-CoV-2), a novel human coronavirus. COVID-19 was declared a pandemic by World Health Organization in March 2020 for its continuous and rapid spread worldwide. Rapidly emerging COVID-19 epicenters and mutants of concerns have created mammoth chaos in healthcare sectors across the globe.
View Article and Find Full Text PDFThe chaos of serologic markers in interstitial pneumonia with autoimmune features can be corrected by the laboratory physician.
Clin Chem Lab Med
February 2020
Division of Diagnostic Immunology, Department of Laboratory Medicine, College of Medicine, Hanyang University, Seoul, Republic of Korea.
Potyviruses, chaos or order?
Arch Virol Suppl
January 1993
Research Institute for Plant Protection (IPO-DLO), Wageningen, The Netherlands.
At first potyviruses were easily distinguished by biological and serological properties because only a few were known and information on their host ranges was limited. The first evidence of serological cross reaction between two of these viruses was reported in 1951 and was further corroborated for three obviously distinct members of the group in 1960. In 1968 attention was drawn to the fact that some legume and non-legume potyviruses have much wider host ranges than previously known and that within the potyvirus group there is as much biological variation within viruses and overlap between viruses as there is in serology.
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