A large pool of HSV-1 was prepared by infecting
six 150-cm2 flasks of Vero cells with HSV-1 at a multiplicity
of infection of 3. After 24 h of incubation at 37°C, the cells
exhibiting 100% cytopathic effect were scraped from the
flasks and centrifuged at 250 x g for 20 min. Next, 300 ml of
supematant was collected and centrifuged at 100,000 x g in
a Sorval rotor in a Sorval Ultracentrifuge (DuPont, Newton,
Conn.). The resultant pellets from the six tubes were resuspended
in PBS and pooled, and one-half was treated with
purified aloe emodin dissolved in 100lo glycerin to give a
final concentration of 50% glycerin.