Assertion: chickenpox's course | /r/HasSubevent | four types of smallpox disease
Facets:
value: based on the rao classification
type: OTHER
Source sentences:
text: At this point, variola major infection could take several very different courses, which resulted in four types of smallpox disease based on the Rao classification: ordinary, modified, malignant (or flat), and hemorrhagic smallpox.