Typical Type-C Virus in Human Leukemia 2

Abstract
The virus HL-23, recently isolated from a patient with myelogenous leukemia, was compared by electron microscopy with virus-like particles observed in human tissues and with several mammalian type-C virus particles. It closely resembled the typical type-C virus particles of murine, feline, and nonhuman primate species, and differed from all particles previously reported in human tissues, including the atypical human placental particle.