[xormapmap]

Many countries do this for immigration. In New Zealand they say your test result doesn't affect your application. Whether that's true I don't know.

[red-iron-pine]

you want to know of any potential carriers and be able to trace potential vectors. plus if you offer socialized medicine you want to know that in order to adjust things like supplies of drugs and coverage for foreign travelers.

Canadian immigration wanted my full medical history for Permanent Resident status, and there was a medical check, blood work, and a chest xray for TB. I was in the US military with injuries from that, and they asked for all of the paperwork.