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Comparison of Assays for Influenza Virus
| Method | Titer (per ml) |
|---|---|
| Electron microscope count | 1010 virions |
| Quantal infectivity assay in eggs | 109 egg ID50 |
| Quantal infectivity assay in cultured cellsa | 107.8 TCID50 |
| Quantitative infectivity assay by plaque formationa | 108 PFU |
| Hemagglutination assay | 103 HA units |
In the same cell line.
