Asking where people live is a common question here on lots of topics as environment, climate and local predators can influence an answer - they aren't asking for your home address :)
Anyway, I live in the UK and outbreaks of avian flu here and in Western Europe are an annual occurrence, at...
I don't think so, just under 'constant review'
The government produce a report on avian flu in the UK and Europe each week here.
Although there are a low number of reports in the UK so far there are a lot in Western Europe (especially Germany).
The concern is that it will now start to rise...
IMO it means enclosed so they can't mingle with wild birds. The roof should be solid so poop can't fall through.
BHWT have an advice page with example pictures of suitable enclosures