A 14-year-old girl who died shortly after being given the cervical cancer vaccine was killed by a "serious underlying medical condition" - not the HPV injection.
Natalie Morton collapsed at Coventry's Blue Coat Church of England School on Monday and died in hospital.
Dr Caron Grainger, joint director of public health for NHS Coventry and Coventry City Council, said it was "most unlikely" she had been killed by the vaccine, adding: "The preliminary post-mortem results have revealed a serious underlying medical condition which was likely to have caused death."
Health officials have moved to ease public fears over the safety of the jab, claiming the likelihood of experiencing a severe reaction is remote - around one in a million.
"The probability of a British woman developing cervical cancer over her lifetime is one in 136, or 0.74% - that's 7,400 times greater," Philip Stevens, the director of health at the International Policy Network said.
The NHS has meanwhile quarantined the batch of vaccine in question and schools and primary care trusts have temporarily suspended the immunisation programme. Manufacturer GlaxoSmithKline has also recalled the batch for further testing.
Copyright © Press Association 2009