The benefits of a cervical cancer vaccine still outweigh the dangers despite two girls dying suddenly, a regulator claims.
But the European Medicines Agency (EMEA) said it will continue to monitor Gardasil, which is competing to be used in the UK government's vaccination programme.
Girls as young as 12 will either receive the injection or a rival compound called Cervarix from September.
However, the EMEA said it has now received reports of women dying after being given the jab, including "two reports concerning the sudden and unexpected deaths of two young women".
One of the young women died in Germany, while the other died in Austria.
But the EMEA said: "In both cases, the cause of death could not be identified.
"No causal relationship has been established between the deaths of the young women and the administration of Gardasil.
"The two European cases were reported as part of the continuous monitoring of the safety of medicines.
"On the basis of the currently available evidence, the EMEA's Committee for Medicinal Products for Human Use (CHMP) is of the opinion that the benefits of Gardasil continue to outweigh its risks and that no changes to its product information are necessary."
"No, it is experimental. What are long-term side-effects? Gardasil caused at least 20 deaths. See articles by Dr Sherri Tenpenny." - Phyllis White, Somerset
"I do not think it is a good idea to vaccinate these young girls, however I believe girls should be given full information on the risk they face and given the choice to proceed with having the vaccine if she considers herself vulnerable and at risk" - Name and address supplied