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.
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Teenage girl dies after receiving Cervarix vaccination for HPV
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England's national vaccination program freezes as batches are recalled
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HPV is a sexually-transmitted virus that causes 99 percent of cervical cancers
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Almost 1.4million girls in England have already received the vaccine
Three other girls at the @placeholder school suffered mild symptoms of dizziness and nausea after receiving the vaccine, according to media reports.