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Ultrastructural analysis of viral inclusions in MDCK cells infected at low temperature. MDCK cells were adsorbed with either T3 or T3-T1M1 at an MOI of 100 PFU/cell, incubated at 31°C, and fixed at 72 h postinfection. Ultrathin sections (65 to 70 nm) were examined using transmission electron microscopy. Boxed regions correspond to high-magnification images shown below. Scale bars, 2 μm (low-magnification images) and 500 nm (high-magnification images).
