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Effect of neuraminidase treatment of MA104 cells on infectivity of SA11 and NCDV strains. MA104 cells were treated with neuraminidase from A. ureafaciens (from 0.5 to 25 mU/ml) for 2 h at 37°C, and the virus infectivity assay was carried out as described in Materials and Methods. The results are expressed as the percentage of infected cells in the absence of neuraminidase treatment (100%) and are the means of two independent experiments with triplicate values.
