Two friends who went backpacking across Vietnam collapsed and died within days of one another from a mystery poison.Canadian-born Cathy Huynh, 26, who taught English in South Korea, decided to take a week-long break with her friend and fellow teacher Karin Joy Bowerman, 27, from Illinois in the United States.
While sharing a room at the Son and Daughter guesthouse in the coastal city of Nha Trang, Miss Bowerman fell ill and was taken to the Khanh Hoa Province General Hospital by her friend last Monday evening.
She did not have any apparent injuries, but was suffering from serious respiratory failure and her blood pressure had dropped to zero.
By 10.30pm that night, Miss Bowerman had died.
Two days later, Miss Huynh, who is of Vietnamese origin, was treated in the same hospital for symptoms of shock and while under intensive care, reportedly suffered several cardiac arrests.
She died in the early hours of Thursday morning.
Forensic official Pham Xuan Thong said authorities have not been able to determine the cause, but it was likely they had been poisoned.
He said samples will be analysed at the National Forensic Examination Center in Hanoi.
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