Abstract
The ultrastructure is described for three types of virus-like particles (VLP 1–3) found in thin sections of the sheep blowfly Lucilia cuprina and, in the case of one type (VLP 1), in negatively stained preparations. VLP 1 appears to be morphologically similar to the particles of chronic bee paralysis virus and RS virus of Drosophila and causes a highly characteristic vesiculation of mitochondria. VLP 2 has two forms, spherical and filamentous; these are seen mainly in the gut where the filaments proliferate in the apical parts of the cells and resemble reovirus-like particles found in the gut of Musca domestica. The third type of particle (VLP 3) is intranuclear and seen only rarely. It is arrayed in quasi-crystalline inclusions which resemble inclusions reported in cells and tissues of Drosophila.
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