FIG 4.
Viral recovery in the pellet from the first centrifugation step (10,000 × g, 10 min, 4°C) in the viral extraction procedure. The sample solid fraction (pellet) has significantly lower viral recovery than the concentrated sample; thus, removal via centrifugation will likely increase the median viral recovery of a concentrated sample. (a) All recovery results with starting volumes of 50 mL combined. (b) Recovery separated by virus with a variable y scale. Comparisons were made with a Welch two-sample t test after log10 transformation of recovery.