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Plaque phenotypes and virus morphology in MDCK cells. (A) Plaque phenotypes of CK/1180, CK/1214, and CK/1180-1214HA viruses. Plaque assays were produced under standard conditions and stained with 0.1% crystal violet. (B) Virus morphology of CK/1180, CK/1214, and CK/1180-1214HA viruses. MDCK cells were infected with viruses at an MOI of 5. At 10 h postinfection, the cells were collected and prepared for virion morphology analysis by using transmission electron microscopy.
