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FLiP purification
| Purification step | Recovery of infectivity, pfu | Recovery of infectivity, % |
| Plate lysate | 7.8 × 1013 | |
| PEG precipitate | 1.6 × 1013 | 20.6 |
| Purified by rate zonal centrifugation* | 4.2 × 1012 | 5.4 |
| Purified by equilibrium centrifugation* | 9.6 × 1011 | 1.2 |
| Concentrated virus | 1.6 × 1011 | 0.2 |
In sucrose.
