> A medical screening in some cases for some communicable diseases (e.g. HIV used to be a ban, no longer, TB still is banned). Only for immigrant visas (green

> A medical screening in some cases for some communicable diseases (e.g. HIV used to be a ban, no longer, TB still is banned). Only for immigrant visas (green card). Ironically you could be spreading TB for years in the US on a student or work visa, but until you can apply for a green card they won't bother to check. I assume this is the legacy of a system where people used to be able to apply for green cards a lot sooner and spent little time on other visas.