LONDON , England ( CNN ) -- The death of a 14-year-old girl in England after she received a vaccination for Human Papilloma virus ( HPV ) has prompted a widespread freeze on the country 's national vaccination program . Millions of girls have received vaccinations for HPV since 2008 , the virus that causes 99 percent of cervical cancers . More than 1.4 million girls have received the vaccination in England since the National Health Service ( NHS ) started administering it in September 2008 . Natalie Morton 's sudden death Monday occurred within hours after she received a shot of the vaccine Cervarix at the NHS at her school in Coventry . Three other girls at the Blue Coat Church of England school suffered mild symptoms of dizziness and nausea after receiving the vaccine , according to media reports . It remains unclear if the vaccine caused Morton 's death . Only an autopsy will be able to determine the exactly cause of death . Glaxo Smith Kline , the manufacturer of Cervarix , issued a recall of the batch of vaccine used in Coventry as a `` precautionary measure . '' Watch reaction to Natalie Morton 's death » . `` At this stage the cause of this tragic death is unknown , '' the company said in a statement posted on their Web site . `` Following immediate quarantine of the batch involved last night , we have taken the decision to voluntarily recall this batch as a further precautionary measure while the investigation into the circumstances surrounding Natalie 's death is conducted . '' On Tuesday several NHS clinics and schools indefinitely postponed immunizations . `` As a purely precautionary measure , we have asked the NHS to quarantine all stocks of HPV vaccine from the batch related to this case , '' a spokesperson for the NHS said . `` Where the local NHS has supplies of vaccine from other production batches , they should continue with the vaccination program . '' Many clinics were forced to close as they checked the numbers on their batches of the vaccine . What is HPV ? HPV stands for human Papilloma virus . Although there are more than 100 types of HPV , only a few of them are known to cause cervical cancer . Most strains of HPV are harmless or cause genital warts . HPV is a common sexually-transmitted disease . Almost half of all women who have sex will be infected at one point in their life , according to the British National Health Service . HPV infects the cells of the surface of the cervix . Infections can clear up on their own or stay for many years without any symptoms and develop into cervical cancer . Ninety-nine percent of cervical cancers are caused by HPV . What is the Cervarix HPV vaccine ? The Cervarix HPV vaccine protects against the two strains of HPV ( 16 and 18 ) that cause cervical cancer in over 70 percent of women . The vaccine is typically injected in the upper arm , or thigh , in three doses within six months , and is recommended for teenage girls . How effective is the Cervarix vaccine ? According to the manufacturer , Glaxo Smith Kline , Cervarix is over 99 percent effective . Is Cervarix the most common vaccine for HPV ? No . Gardisil , manufactured by Merck is used by the majority of vaccine programs worldwide . Gardisil protects against four strains of HPV ( 16 , 18 , 6 and 11 ) . Strains 6 and 11 cause less serious conditions , such as genital warts . Gardisil proved comparatively effective in trials carried out by Merck . Of 23 million American girls who have already been vaccinated , 32 deaths were reported , though the reports do not determine if the deaths were caused by the vaccine or just a coincidence . Why was Cervarix chosen for the UK ? According to the NHS , Cervarix , `` was selected because the bid from this company scored higher than the competitor in the adjudication process against pre-agreed award criteria . The pre-agreed award criteria were shared with the manufacturers during the process so that they were fully informed of the criteria against which their bids would be evaluated . '' When was the vaccine introduced ? In September 2008 , England began a national program to vaccinate girls aged 12-13 , and a three-year catch up campaign offering the vaccine to 13-18 year old girls . Do condoms protect against HPV ? Using condoms reduces the risk of HPV transmission , but infection is still possible because HPV can be spread by contact with parts of the body that the condom does not cover . What are the known dangers associated with taking the HPV vaccine ? Cervarix has undergone rigorous safety testing as part of the licensing process required in the UK and other European countries , according to the NHS . The most commonly reported side effects are mild swelling or pain at the injection site , nausea , a mild temperature , dizziness , diarrhea and muscle aches . In rare cases allergic reactions in the form of skin rashes and in very rare cases anaphylactic shock has occurred .
Teenage girl dies after receiving Cervarix vaccination for HPV . Score: 6 HPV is a sexually-transmitted virus that causes 99 percent of cervical cancers . Almost 1.4million girls in England have already received the vaccine .