My DD had this recently. She started off with a few days of high fevers and being irritable and then came down with blisters on her hands, feet, in her mouth and on her bottom. It's incredibly painful and my hubby caught it and can vouch for the discomfort. He said his hands were sore, hot and itchy. Dd was prescribed Zyrtec for babies for the itchiness because she hadn't slept in days and we alternated nurofen and panadol. She couldn't eat either. Definitely highly contagious. It's classed as a mild infection but it's really uncomfortable for anyone who gets it.