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Significance of Extracellular Enveloped Virus in the in vitro and in vivo Dissemination of Vaccinia

The Department of Virology, Karolinska Institute, School of Medicine, SBL S-105 21 Stockholm, Sweden

The significance of extracellular enveloped vaccinia (EEV) for the in vitro and in vivo dissemination of vaccinia virus was investigated. The quantity of in vitro released extracellular virus correlated very closely with the ability of 13 vaccinia strains to cause long-range spread of infection (comet formation) in cell cultures infected at low m.o.i. but was not correlated with plaque size. The kinetics of virus spread after low m.o.i. was related to the amount of virus released from primary infected cells but not to their content of intracellular naked vaccinia (INV). Most extracellular vaccinia virus from IHD-J-infected RK-13 cells banded in CsCl density gradients as EEV (88%) while very little banded as INV (2%). Antisera to the envelope prevented comet formation while antisera to INV did not.

CsCl centrifugation of blood-borne extracellular virus from rabbits infected intravenously with vaccinia virus after cyclophosphamide treatment revealed that 64% of the virus banded as EEV but only 11% as INV. High in vitro EEV-yielding vaccinia strains were able to spread from the respiratory tract to the brains of mice and cause death. Low in vitro EEV-yielding vaccinia strains were generally not able to disseminate in vivo or cause mouse mortality. The notable exception to this trend was strain WR, which, although releasing small amounts of virus in vitro, could nevertheless very effectively disseminate in vivo, causing a high rate of mouse mortality. Treatment with anti-envelope serum protected mice from a lethal vaccinia infection whereas antiserum to inactivated INV did not. These results indicate that the in vitro dissemination of vaccinia infection is mediated by EEV and implicate EEV as having a role in the in vivo dissemination.

Received 14 December 1980; accepted 16 April 1980.

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