Background: We conducted this review to summarize the relation between viral mutation
and infectivity of SARS-CoV-2 and also the severity of COVID-19 in vivo and in vitro. Method …

The severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) that was first identified
in December 2019, in Wuhan, China was found to be the etiological agent for a novel …

Background A severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection
lasts longer in immunocompromised hosts than in immunocompetent patients. Prolonged …

Abstract Introduction Coronavirus Disease-2019 (SARS-CoV-2) started its devastating
trajectory into a global pandemic in Wuhan, China, in December 2019. Ever since, several …

Background: From the start of the COVID-19 pandemic, new SARS-CoV-2 variants have
emerged that potentially affect transmissibility, severity, and immune evasion in infected …

Since severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has caused global
pandemic with alarming speed, comprehensively analyzing the mutation and evolution of …

The third pandemic of coronavirus infection, called COVID-19 disease, began recently in
China. The newly discovered coronavirus, entitled SARS-CoV-2, is the seventh member of …

The sudden rise in COVID-19 cases in 2020 and the incessant emergence of fast-spreading
variants have created an alarming situation worldwide. Besides the continuous …

Objectives: More than two years into the COVID-19 pandemic, SARS-CoV-2 still remains a
global public health problem. Successive waves of infection have produced new SARS-CoV …

Background SARS-CoV-2 began spreading in December 2019 and has since become a
pandemic that has impacted many aspects of human society. Several issues concerning the …