Abstract
The ultrastructure, pathology, and transmissibility of a new cytoplasmic polyhedrosis virus of Culex restuans are described. Virus development is limited to the cytoplasm of cells of the gastric caeca and posterior portion of the midgut. Virus particles are spherical, measure 35 nm in diameter and are surrounded by a capsid. They are assembled within a virogenic stroma and are occluded singly. Polyhedra contain one to many virions, are pleomorphic and range from 0.1 to 1.0 μ in size. They are formed by the coalescence of individually occluded virions. Infections can be vertically transmitted to larvae by infected females via the egg but at a very low rate (10.5%). Infections acquired in this manner are pathogenic and most individuals die as larvae or pupae. The virus may also be transmitted orally to larvae via the ingestion of polyhedra. These infections are not as pathogenic and most infected individuals survive to adulthood. The virus is specific for C. restuans and cannot be transmitted to Culex pipiens or Culex territans.
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