A couple from Oxfordshire are campaigning to increase awareness about seizures after their young son contracted a rare illness which left him with brain damage.
Three years ago, Oliver Johnson, who is now six, had a huge seizure and was diagnosed with encephalitis, which results in the brain swelling.
Oliver now can't walk or talk and needs to be fed with the help of a tube. His seizure came after a short period of feeling unwell.
Mark McQuillan has been speaking to his parents, Mike and Suzy Johnson.