claim: inference of sars-cov-2 spike-binding neutralizing antibody titers in sera from hospitalized covid-19 patients by using commercial enzyme and chemiluminescent immunoassays
evidence_1: conclusions: the suitability of sars-cov-2-s-igg commercial immunoassays for inferring neutralizing activity of sera from hospitalized covid-19 patients varies widely across tests and is influenced by the time of sera collection after the onset of symptoms.", "overall, the degree correlation between antibody titers resulting in 50% virus neutralization (ntab50) in the pseudotyped virus assay and sars-cov-2 igg levels was strong for the euroimmun sars-cov-2 igg elisa (rho=0.73) and moderate for the remaining assays (rho=0.48 to 0.59).", 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  "patients and methods: ninety sera from 51 hospitalized covid-19 patients were assayed by a pseudotyped virus neutralization assay, the liaison sars-cov-2 s1/s2 igg, the euroimmun sars-cov-2 igg elisa, the maglumi 2019-ncov igg and the covid-19 elisa igg assays.")