These early outbreaks in Southeast Asia had fatality rates ranging from 10 to 50 percent, but as more was learned about the disease, these rates dropped.
दक्षिणपूर्व एशिया में इन आरंभिक प्रकोपों से मरनेवालों की दरें १० से लेकर ५० प्रतिशत तक थीं ।