Virions have a buoyant density in CsCl of 1.3-1.347-1.4 g cm-3
Purified preparations are found 1 sedimenting component(s) or 2 sedimenting component(s)
Sedimentation coefficient is 200-223.9-275 S20w; of the other(s) are 212 S20w
Isoelectric point pH is 4
Thermal inactivation point (TIP) is at 75-81.5-90°C
Longevity in vitro (LIV) is 1-8-32 days.