Episome-carried Surface Antigen K88 of Escherichia coli III. Morphology

Abstract
Two nonfirmbriate strains of Escherichia coli and the K88+ counterparts, obtained by episomal transfer of this antigen, were studied with the electron microscope. Specimens were prepared with the spray drop method and were studied after shadow-casting. Under these condition, the alteration in surface structure, due to the acquisition of K88 antigen, appeared as a fur of fine filaments, distinctly more flexible than fimbriae. Purified K88 antigen was also studied and found to have the same structure.