Assertion: polio | /r/HasProperty | problem
Facets:
value: in the united states
type: LOCATION
value: in poor, undeveloped countries
type: LOCATION
Source sentences:
text: That said, polio is still a problem in poor, undeveloped countries.
text: Is poliomyelitis still a problem in the United States?
text: Today, there are just a handful of polio cases in the United States every year, and most of these are “imported” by Americans from developing nations where polio is still a problem.