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Characterization of an Enterovirus Associated with Acute Infectious Lymphocytosis

Departments of Microbiology and Immunology, Cell Biology, and Pediatrics, Albert Einstein College of Medicine, Bronx, New York 10461, U.S.A.

An enterovirus (EVU-16) previously isolated from children with acute infectious lymphocytosis has been further characterized. The EVU-16 virus sediments as a 135S particle in sucrose gradients, has a density of 1.335 g/ml in CsCl, contains 4 polypeptides and has a single stranded RNA genome sedimenting at 35S. These structural features as well as the presence of a virus-related particle, the procapsid, are similar to those of other enteroviruses. However, the largest polypeptide of EVU-16 is 49 000 daltons, which is considerably larger than the corresponding polypeptide from poliovirus; the sizes of the other three viral polypeptides were similar in both viruses. Attempts to induce lymphocytosis by the inoculation of EVU-16 into various animals, including immunologically aberrant ‘nude’ mice, were unsuccessful.

Received 26 August 1975; accepted 29 October 1975.