Assertion: encephalitis's infection | /r/HasSubevent | development of encephalitis
Facets:
value: occasionally
type: DEGREE
Source sentences:
text: Natural infection with wild-type measles, mumps or rubella viruses occasionally leads to development of encephalitis, at estimated rates of one case per 1000-2000 patients infected with measles, 400-6000 patients infected with mumps, or 5000 patients infected with rubella, respectively .