Radioimmunoassay methods were evaluated for immunoglobulin G and immunoglobulin M antibodies against Bacteroides fragilis antigen. Of 12 serum samples from patients with B fragilis infections, 9 had higher concentrations of immunoglobulin G antibodies than any from 11 control subjects. Of 9 serum samples from infected patients, 6 had higher concentrations of immunoglobulin M than any from contr...

The N-terminal 20 residues of 13 heavy immunoglobulin chains from myeloma protein of the BALB/c mouse are compared with the same residues of 15 other heavy chains described in the literature. Sixteen of 28 sequences are different from one another. These proteins fall into four major sets, with 18 of the proteins in the largest set being further divisible into at least five subsets. This pattern...

ObjectiveThe aim of this study was to evaluate the seropositivity rapid immunoglobulin G (IgG) and M tests in patients recovered from coronavirus disease 2019 (COVID-19).BackgroundRapid severe acute respiratory syndrome 2 (SARS-CoV-2) antigen-detection can give results less than 30 min detect SARS-CoV-2.Patients methodsThis case–control performed Toluca, Mexico, September October, 2020. Rapid t...