I'm not entirely sure what is the relevance to the BA forum. This has, strictly speaking, nothing to do with BA and is covered in other (more relevant) sections of FT.

Countries change travel requirements frequently and it is always worth double checking on national travel websites. There have been recent changes to entry conditions to the likes of Brazil, Canada, etc. Unfortunately, national authorities are rarely very good at advertising such changes so keeping an eye is really the only way to avoid bad surprises.