My point is, if you don't know what you're looking for how do you stop it/people who may be a bit poorly but you dont know why, and you don't know what you're stopping, how do you stop sick/sick looking people/asymptomatic people traveling?
You can't stop asymptomatic people, typhus mary is the prime example.
Also I've been in the same room as some of the top jet engineers at Rolls Royce Derby....
EDIT: I understood a third of what they said with people explaining to me what they meant.
Cool.
@lynx started
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My point is, if you don't know what you're looking for how do you stop it/people who may be a bit poorly but you dont know why, and you don't know what you're stopping, how do you stop sick/sick looking people/asymptomatic people traveling?