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Flow cytometric characterisation of BALF cells recovered from lungs of uninfected control (□) and in utero PRRSV-infected (■) piglets at various stages after birth. Each bar represents the average percentage±S.D. (upper lines) of the number of examined piglets. At 2, 4 and 6 weeks of age, respectively, 7, 8 and 9 control piglets, and 7, 8 and 6 infected piglets were examined. Significant difference between age-matched controls and infected piglets: *P<0.05; **P<0.01; ***P<0.001.
