Assertion: polio | /r/AtLocation | developing countries
Facets:
Source sentences:
text: However, polio still exists in some developing countries.
text: Polio still occurs, however, in some developing countries.
text: Now due to immunisation, polio is rare in most parts of the world, although it persists in some developing countries.
text: Polio still occurs in certain developing countries, mainly in some parts of Africa and south Asia (3).