Most cases occur in children.
A team of researchers from the University of Michigan and the University of Iowa have gained new insights into the way the virus attacks at a cellular level. Their findings will be published in the August issue of Nature Medicine . There's no specific treatment for infection and no way to prevent progression to the more deadly forms of the disease. No vaccine is available or likely to become available anytime soon. These measures were very effective in the past but appear to have failed in recent years.