Assertion: dengue | /r/HasProperty | difficult
Facets:
value: often
type: TEMPORAL
value: to tell the difference
type: PURPOSE
Source sentences:
text: However, when dengue is in its early stages, it can be difficult to tell the difference between this disease and other infections caused by viruses.
text: As syndromes, dengue fever, DHF, and DSS express considerable symptom overlap and are often difficult to distinguish.4