Assertion: rheumatic fever | /r/AtLocation | regions of the world
Facets:
value: sporadically
type: TEMPORAL
Source sentences:
text: For example, in regions of the world where rheumatic fever is most common—developing countries and some indigenous populations in affluent countries—it occurs sporadically rather than in epidemics, and few cases may be attributed to highly virulent strains such as those held responsible for the United States outbreaks.3One author has suggested that rheumatic fever in the United States and Britain became less severe over the last century, and that some manifestations common in the past (particularly severe carditis, subcutaneous nodules and chorea) are now rare.4