My 15 year old son got struck down with this approx 4 weeks ago and we have had a rough time with being in Southampton Hosp now for physio rehab to get him back on his feet again. He was really very poorly and on a ventilator in PICU but thankfully he is now making progress, albeit it a slow road.
I would be interested to hear from anyone else that has had it to see what their recovery period was, with special needs children it's obviously a whole different ball game.