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Particle size distribution of SARS-CoV and SARS-CoV-2. (A, B) Histograms of maximal particle profile diameter without spikes in ultrathin (65 nm) sections (datasets 01 and 02; Table 1). (C, D) Histograms of maximal particle profile diameter without spikes in electron tomograms of thin (150–180 nm) sections (datasets 04 and 05; Table 1). Particles were measured at their thickest diameter (see Fig. 4 and Methods section). M = median; N = number of measured particles.
