Mike,
May I compliment you on your post about the trip back from Venezuela. It was a fascinating read and very well told. As I expected, there were lessons to be drawn from it;
1. During a stopover, it is best not to go into situations that might result in a challenge your immune system.
2. However, if you must go into areas where there are iffy public health conditions, say if you're a bush pilot working for a charity in some remote area of a hot, developing country, then you need to think about the likely incubation period of viral/bacterial nasties that you might encounter in the area, and be on the lookout for symptoms for perhaps days afterwards.
3. Airlines are likely to be unforgiving where anything happens that compromises flight safety, even when it happens to long established staff with a hitherto fine flying record.
All I can say now is please, MORE, MORE, MORE.
Very best regards,
Broomstick.