Fig. 7From: Antimicrobial growth promoters approved in food-producing animals in South Africa induce shiga toxin-converting bacteriophages from Escherichia coli O157:H7.Electron micrographs of four bacteriophages. (A) Long hexagonal head with a long tail, (B) oval/circular head with a long tail. (C) Icosahedral/hexagonal head with a thick contractile tail. (D) Elongated (oblong) head with long tail. Bars = 200 nmBack to article page