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. 2003 Jul 15;29(3):179–188. doi: 10.1016/S1386-6532(03)00122-7

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Fig. 1 — Comparison of real time qPCR, CE-ELISA and virus culture over a range of 10-fold serial dilutions of (A) A/Shangdong/3/93 (H3N2), (B) A/Taiwan/1/86 (H1N1) and (C) B/Lisbon/3/96. The virus titre in pfu/ml for the input virus dilutions is estimated from the stock concentration. log values (Y-axis) are given as mean vRNA copies/ml for real time qPCR and TCID₅₀/ml for CE-ELISA. +/− Refers to the presence/absence of haemagglutination activity in virus culture.