Fig 4. Putative PSCNV particles revealed by electron microscopy.

(A) Adjacent histological transverse section, to orient EM images. Black rectangle corresponds to location of (B), a low-magnification EM view to provide context. White rectangle corresponds to location of (C), in which putative viral particles enclosed within membrane sacs are indicated by arrowheads. The white rectangle in (C) and square in (B) indicate positions of higher-magnification views shown in (D) and (E), respectively, each illustrating several viral particles within a membrane sac. In top-left of (C), note the mucus granules adjacent to virus-laden sacs (see also S2 Fig). Scale bars as indicated.