to assess further the relationship of this streptococcal serotype to rheumatic fever in chile , sera of 34 patients with rheumatic fever and an equal number of age- , sex- , and race-matched controls were assayed for antibodies to types 5 , 6 , and 24 in an enzyme-linked immunosorbent assay with purified pepsin extracts of the respective m proteins as solid-phase antigens .
C0003241
antibodies
C0700271
m proteins