Part of the agenda of control it seems these days if you cough you are spredingthe plague! What absolute nonsense as if filling out a form is going to do anything, It really is a backward step. Imagine you had spent oh I don't know , say $4k on a trip and did develop a funny nose prior to travel, I personally would lie when filling out the form

Vietnam is such a beautiful country I first visited in 2006 and have returned twice, I hope this health visa does not impact upon visitors not coming