Assertion: dengue | /r/HasProperty | difficult to diagnose
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Dengue often is difficult to diagnose, and a presumptive diagnosis is established initially based on clinical signs and symptoms, while waiting for laboratory confirmation.
text: Dengue fever can be difficult to diagnose because its symptoms overlap with those of many other viral illnesses, such as West Nile virus and chikungunya fever.