A baby is 4 days old. The baby's condition after birth is severe (tonic-clonic seizures, no newborn reflexes). The muscle tone is asymmetrical. The large fontanelle exhibits increased pulsation and is 3x3 cm in size. The baby's respiration rate is 32/min., with apnea episodes. The heart sounds are clear and rhytmical, the heart rate is 122/min. Neurosonogram shows enlarged lateral ventricles with echo positive inclusions in the ependyma. What is the most likely cause of the child's condition in this case?