FIG. 1.

Binding of ¹²⁵I-labelled hLf to pneumococcal strains belonging to 24 different serotypes, expressed as a percentage of the total radioactivity bound to the cells. Each point represents the mean binding (from triplicate determinations) to a strain. Binding of less than 5% was considered background. A total of 63 strains were tested. Strains were obtained from culture collections (American Type Culture Collection or National Collection of Type Cultures) (n = 5), and serotyped clinical isolates were from the Statens Serum Institute, Copenhagen, Denmark (n = 12), and the Institute of Medical Microbiology, Düsseldorf, Germany (n = 46).