In Korea, another deadly form, P vivax, or tertian malaria, can be found.
Tertian malaria is not the deadliest form of the disease, but it is recurring and is the most widespread. This year, 338 people have been afflicted.
After an epidemic in 1970 was stopped, there were fewer than 100 malaria patients by the early 1990s. In 2000, however, there were 4,142. The number briefly decreased to 864 in 2004; in the past two years it has climbed back to 2,000.
The Korea Centers for Disease Control and Prevention have classified 22 cities and districts in Gangwon, Gyeonggi and Incheon as “malaria danger zones,” with 10 out of 1 million people affected annually.
The stats seem funny to me. Is 10 out of a million averaged over ten years? Korea has fifty million people so 500 is 10 out of a million. Frequently the number of cases is greater than that, but more, if the disease is only in the northernmost cities, we are talking about a much smaller total population. They say reporters don't understand stats, but it could be a bad translation.
Wikipedia on malaria.