Quoting from the link...

The Mekong Delta province of Soc Trang has become the third province in Vietnam to report bird flu outbreak this year

I dont think that its time to go into panic mode yet, as I havent heard that it has directly transmitted, most but not all cases appear to be through direct contact with poultry.

Having said that, viruses can mutate in the course of just a day or so, so caution is really the very best suggestion anyone can offer.

Should they, or anyone else travelling to those regions begin to feel the slightest bit unwell, then the best advive is to get to your medico immediately.

Hope all is ok for your family.