Information has been received from a nurse via a company representative. The nurse reported that a daycare provider who worked with the nurse's health department forwarded a social media post to the health department regarding female patient of unknown age. The patient's medical history, concurrent condition and concomitant medications were not reported. On an unknown date, the patient was vaccinated with an unidentified Merck HPV vaccine (dose, route, lot # and expiration date unknown) for prophylaxis, and then developed seizures. The outcome of seizures was unknown. The patient stated that her seizures associated with the HPV vaccination was validated by her physician. The nurse reported that she read the social media post quickly so some of the information she reported may need to be updated or corrected. This is a non-valid report due to it was a second hand information and there was no contact details provided for the original reporter. Follow up information was received from a nurse via company representative on 02-AUG-2018. Information was received regarding 13 years old girl. On 10-MAR-2018, the patient was vaccinated with an unidentified Merck HPV vaccine for prophylaxis. On 08-MAY-2018, 59 days after vaccination, she was not feeling well, got dizzy and passed out. The patient was taken to the Emergency Room (ER) and was told she was dehydrated but fine. On 10-MAY-2018, at school she passed out, but noticed she had some movement in her hand. Blood work was performed and all was normal. On 11-MAY-2018, she passed out in the back seat and could not wake her. Her right hand was shaking and had no response from her. Again on 12-MAY-2018 and 13-MAY-2018, same things, "passing out" with shaking it was noticed that her right leg was shaking too. Physician stated that they sounded more like seizures then just passing out. On 14-MAY-2018 and 15-MAY-2018, had more seizures at school. On 16-MAY-2018, she had a seizure in the chair. Patient was taken for EEG's (Electroencephalogram) she has CT scans and a lot of blood work. She had a seizure when the EEG was on. The results showed non epileptic seizures. She started doing Neurofeedback and Biofeedback training. The HPV vaccination altered her hormone. They are making her brainwaves not connect and causing the seizures. At this point patient was up to 2 seizures a day that last on average 8-10 min long. She had the seizures in many places and all times of the day. On 06-JUL-2018 she was taken to the ER after falling when she had seizure and hitting her head on concrete floor. Physician confirmed that yes, this was a side effect from the vaccination and was causing seizures. This was not reversible, it altered her hormones for good. She can learn to control them with the feedback training. As of today, she was going to weekly doctor appointments and they set her up with Home feedback training. This way she can do the exercises at home too. She continues to have seizures but had them controlled to about 1 a week (the outcome of the event was recovering). The outcome of hormone level abnormal and dehydration was unknown. The reporter considered seizure and hormone level abnormal to be related to unidentified Merck HPV vaccine. The causality assessment was not reported for the event dehydration. Upon internal review, seizures was determined to be medically significant. Upon receipt of follow-up information it was determined that this case is now valid because the primary reporter can be contacted.