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" ... The levels of IgG neutralizing antibodies (as measured using a spike protein pseudotyped virus) were measured in both groups eight weeks after release from the hospital. The levels of IgG and neutralizing antibodies were significantly decreased in the majority of patients in both groups. The decrease in neutralizing antibodies was more pronounced in symptomatic as compared to asymptomatic patients. ... "
" ... Variants spread rapidly through populations and become the dominant strains, at least locally. There has been an enormous effort to understand the extent, function, and epidemiological consequences of these variants. In the past few months, genome sequencing efforts isolated many SARS-CoV-2 variants throughout the world. Other variants were isolated in laboratories using monoclonal antibodies or pseudotyped viruses, which are virus particles whose envelope proteins can be dictated by researchers to measure antiviral compounds and antibody responses. ... "