A boy has been told his “next seizure could be his last” - after being diagnosed with one of the world’s rarest deadly diseases.<br /><br />William Howard, nine, was told by doctors his initial symptom, a twitch in his right leg, could be down to stress from playing Minecraft. <br /><br />But after “endless” medical investigations, an MRI confirmed he has mitochondrial disease - which means his cells won’t work correctly. <br /><br />He is one of 10 people in the world who have his particular variation - DNML-1. <br /><br />His parents, Simon, 45, and Mihaela, 43, say he went from a normal, healthy little boy to paralysed by seizures, seemingly overnight. <br /><br />And they’re having to take each day as it comes - never knowing whether it could be their last with William.
