My, almost 6, DS has been unwell this week - temperature and off food for 48 hrs. Today he's complaining he can't walk due to pain behind both knees. This happened last month too following a similar short-lived virus. Read lots of things about this being a common post-viral reaction among children but I'm a bit concerned it's happened again so quickly. Will obviously consult our GP but can't really do anything until Monday am now. Last time, after a day or so of walking on tip toes he was back to his active self, any similar experiences? Thank you.