All the cases have occurred sporadically, with no known links between the patients, who range in age from 1 to 60.

It is now, too, that the first small copper items occur sporadically.

Flowering is, however, not an annual event and will occur sporadically if at all.

Plague cases continued to occur sporadically at a modest rate until the summer of 1666.

The track was abandoned after 1975 and events only occurred sporadically such as in 1981 when the government allowed the sport again.

The phenomenon occurs sporadically, although this time the consequences were greater than usual.

Work on the neural basis of spirituality has, however, occurred sporadically throughout the 20th century.

Snow occurs sporadically, with an average annual accumulation of 5.8 inches.

Rallies and demonstrations occur sporadically throughout the country often at short notice.

Public protests, demonstrations, and strikes in response to world or local events can occur sporadically.