Immuno-gold electron micrographs showing the subcellular localization of RSV RNPs in the midgut and muscles of viruliferous insect. A: RSV RNP particles in the midgut lumen of SBPH. B: The virus invades into the insect midgut epithelial cells. C: The midgut epithelial cells of non-viruliferous SBPH as negative control. D: A few RNPs in the muscle tissues of RSV-infected SBPH. E: No RSV RNPs exist in muscles of non-viruliferous insects. RSV RNPs are indicated by arrows. Scale bars: 0.2 μm (A, B, C, D) and 0.5 μm (E).