What's going on here? Up 25% on Friday on high volume (20...

What's going on here? Up 25% on Friday on high volume (20 million). I would not have thought the announcement of the previous day (I think) regarding agreement with three US airlines to supply medical "kits" on their aircaft would not have been enough to stimulate this sort of activity, would it? I feel that their business concept is basically sound, ie. to set up medical clinics for ex-pats and others in places like China and Russia where the provision of local medical services can be a bit dicey. Have they been under valued, in which case we should see the run continue? The buyer depth certainly looks strong. I have only a modest holding but thinking of topping up on Monday. Comments please?