The first suspicious case has been detected in the morning of April 27, 2009.

In November 2009, 351 cases has been detected for each 100.000 inhabitants.

It was mentioned that more than 10,000 human cases were detected in Iran.

About 200 cases are detected each year, and dozens of people saved from death.

Overall prevalence has increased since the first case was detected in 1984.

No new cases have been detected in Vietnam for 17 consecutive days.

It is not known to what extent the case total has risen because of a new effort to detect cases.

"The virus got away before the first cases were detected," he said in a telephone interview.

The cases were first detected from 1985 to 1992.

Only about 500 cases have been detected in the Soviet Union.