Fig. 2

Transmission EM of a thin section through the sediment of swab sample 1 (Epon embedding). SARS-CoV-2 particles (arrows) are visible close to a rod-like bacterium (ba; A) and unidentified crystalline (cr) and vesicular (ve) aggregates (A, B). The virus particles (arrows; B) reveal all features of coronaviruses, such as an enveloping bio-membrane (arrow), spikes with a knobby head (black arrowhead), and an electron-dense, granular interior (white arrowhead) representing the ribonucleoprotein of the virus [8]. Note, that the granular profiles are less distinct and larger in size than reported for other preparations [8]. Scale bar in A = 0.5 µm and in B = 100 nm