An inquest has been hearing of the death of Essex teenager Amie Miller.
Amie, from Stanford-le-Hope, died of encephalitis, which causes inflammation of the brain.
The origin of her condition, characterised by vomiting and flu-like symptoms, is unknown.
Doctors believed she was getting better and missed signs she was deteriorating.
Errors included misinterpreting the results of a CT scan and failing to carry out a MRI scan which would have identified the condition, despite one being recommended.
Stepfather Mbarek Aitmarri said the family would be considering legal action.
From the moment Amie died we faced constant evasion and were passed from one person to another.
We feel our daughter has been treated as collateral damage and there's no real recognition of our loss.It has taken five years to reach this stage and, if our concerns had been addressed sooner, perhaps other people's lives could have been saved.Procedures have not changed in five years - the inquest heard basic neurological checks are still not carried out as standard. It is this which worries us most.
For us there's no doubt that systematic failings caused Amie's death.I drove her to hospital and I ask myself everyday whether, if I had taken her to another hospital, she would still be alive.
More top news
Up to 30 police officers are searching a home in the Norwich area in connection with what's being called a "sensitive investigation."
Ipswich Town recorded a third straight victory in a row with an impressive 2-1 win at Wigan Athletic.
A man dressed in a gimp suit is having his photo taken with people to raise money for a voluntary mental health organisation in Colchester.