FIG 6.

Virus particles imaged by ns-TEM. Released virions from infected MDCK cells (MOI = 10; 12 hpi) (experiment described in the legend of Fig. 4B) are shown. (A to C) Representative virus particles for PR8-RKI (A), OP7 (B), and PP (C) virus. Bars, 50 nm. (D) Diameters of virions determined from ns-TEM images. For nonspherical particles, we determined means of the length and width. Diameters of 16, 17, and 23 virions were determined for PR8-RKI, OP7, and PP viruses, respectively. Error bars indicate standard deviations. ***, P < 0.001 by Student’s t test.