Bao died today ( The guy who worked for us for many years – age 37 ) of Liver flukes – The same thing  that killed one of our other workers a couple of months back.  From what I understand you get it/them from eating raw fish.  I know you can get medicine to kill them – Not generally available in the UK but it can be prescribed under medical supervision because it is so strong. Why they didn’t administer it here I don’t know.