Dr. Blitshteyn noted that the treating physicians did a very thorough job of ruling out other causes, including viral, fungal, bacterial, other infectious pathogens, genetic, metabolic, toxic, nutritional, congenital, and paraneoplastic (cancer) etiologies of A.M.'s condition—based on the diagnostic workups she received in 2007, documented in the medical records. Tr. at 29. The most likely etiology of A.M.'s encephalitis, according to Dr. Blitshteyn, is an autoimmune response in the limbic portion of her brain. Tr. at 26. More explicitly, Dr. Blitshteyn's opinion was that the HPV vaccine "likely resulted in [a] vaccination-induced autoimmune response and formation of [an] autoantibody cross-reaction with the neuronal components of the limbic system, thereby resulting in a vaccine-induced acute autoimmune limbic encephalitis." Pet. Ex. 25 at 6; see also Pet. Ex. 27 at 1; Tr. at 27. She testified that from what is known from other types of autoimmune limbic encephalitis, such as the voltage gated potassium channel antibody encephalitis, antibodies form against the voltage gated potassium channels in the cellular membranes which cause the normal electrical and water balance to be disturbed. When that occurs, she said, the neurons become hyperexcitable, secondary to this process and thereby result in seizures. Tr. at 26-27. She noted that seizures have been reported to occur in the wake of some vaccinations. Tr. at 27. In this case, she said that it was logical to expect a more pronounced autoimmune response after the second vaccination than the first, that the signs and symptoms were consistent with an autoimmune limbic encephalitis, that the timing was appropriate and that the mechanism of molecular mimicry would explain the syndrome. Tr. at 31.