Cultures of RK13 and BHK21 cells infected with rubella virus were examined by electron microscopy when the cultures showed maximal cyto-pathic effects. Infected RK13 cells contained crystalline inclusions (spacing 190 Å) as well as typical virus particles of total diameter 600 Å, with a dense 300 Å core. Identical particles also occurred in infected BHK21 cells, but in these no crystals were observed. Neither crystals nor particles were found in control cells. The particles did not resemble myxoviruses.
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