Several NZ girls were struck by food poisoning after eating in a ChangMai food market, in Thailand. One of them is already dead, and the other two are recovering in hospital. Food preparation standards are not high in Indo-China, so I suggest if you are eating in such markets in Thailand, Cambodia, Vietnam or Laos, you observe a high level of caution, and know exactly where your closest international hospital is because the doctors are idiots (in rural area particularly).
I ate at a local food store. It was owned by the parents of a girl I had met. I met with all their friends at their English school. I was concerned, but got food poisoning regardless. I broken into a bad sweat. I went to a local clinic, but no one spoke English, and the doctor seemed to have no idea. I thought I had some iodine difficiency because I had some discolouration on my skin, but that was just an old bruise :)
Anyway, I jumped on the first bus to Hanoi and went to the international hospital and was attended to by an American doctor. Problem resolved straight away.