Vietnam has asked the World Health Organisation to help investigate a mystery disease that has killed 19 people and left 171 others sick.
Le Han Phong, chairman of the People's Committee in Ba To district in Quang Ngai province, said patients first experience a rash on their hands and feet along with high fever, loss of appetite and eventually organ failure.
He said nearly 100 people remain in hospital, including 10 in critical condition. Patients with milder symptoms are being treated at home.
Mr Phong said the first case was detected last year and that the disease had died down until a spate of new infections were recently reported, mostly in one impoverished village.
A Ministry of Health investigation was inconclusive.