The other 58 cases are sporadic cases with no clear connection to the three outbreaks.

BBC: Hospital treats four for measles

It does not normally infect humans, although sporadic cases do occur usually in people who have had close contact with pigs.

BBC: Experts probe deadly Mexico flu

Before 1996, sporadic cases of cyclospora infection turned up only in people who traveled in developing countries and in those with HIV or another condition causing immune-system compromise.

CNN: Cyclospora infection

Experts say that it is reassuring to see that cases are now sporadic, as it suggests the virus can't easily be contracted by one person from another.

WSJ: Bird Flu Found Outside China's Mainland