A British teenager who went to hospital complaining of shortness of breath died two days later of suspected organ failure.
Maria Titley, 17, of South Wales, was due to go out with friends but said she was not feeling well and stayed home.
She went to the local Port Talbot hospital for a general check-up but was rushed to a major hospital nearby where doctors battled for two days to try to safe her life.
Close friend Shaunagh Slattery, 17 told Britain's Daily Mail: "She just had bad breathing and chest pains for a few days - she was going to try and shake it off.
"She thought it was something normal, just a chest infection, she phoned up the hospital and went along to get some help with her breathing.
"It just happened so suddenly, no one ever expected this, it's really upsetting how someone can go so quickly."
Maria was remembered as a person who had many plans and who would brighten everyone's day.
The headmaster at her school, St Joseph's Roman Catholic Comprehensive School, told a special assembly that Maria "really was a model pupil with an unblemished school record. She was friendly and bubbly and her warm personality and sunny disposition meant that she was popular with staff, peers and pupils of all year groups."
Police are investigating but the death is not suspicious.