This year cases were the highest in Japan where around 273 contracted this flesh-eating disease in less than nine months in 2014.
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"Researchers are not sure why the number is growing. There is so much we still don't know about this disease," said the NIID official.
When a person is infected with streptococcal bacteria, he or she will normally develop only minor symptoms such as a sore throat or skin infection. The bacteria commonly exists in the body but does not usually spread to certain organs.
“Of the 712 patients reported between 2012 and 2014, 207 or 29 percent of the total, died. As many as 76 percent of the fatalities occurred within three days after symptoms emerged. The majority of patients are aged over 60 but younger people, including children, also contracted the disease,” said the NIID official.
Source-IANS