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Flow cytometry for determining susceptibility of monocytic cells to PR8 virus infection. U937 or THP-1 cells infected with PR8 virus at m.o.i. of 3. At 24 h post infection, cells were analysed for influenza NP by flow cytometry. Histogram shows U937 cells (a) or THP-1 cells (b) that are NP + . Compared to THP-1 cells, U937 cells are significantly more susceptible to PR8 virus infection (two-tailed t test: P = 0.001)
