[MargaretR]

I recently chickened out of a date booked for an over 65 flu vaccine, because I have severe vitamin deficiency problems which were not caused by an unhealthy diet, but my inability to absorb vitamins from food.

I know that I would have had side effects (did last year)

There is another factor to consider - any vaccine has small residue of toxic mercury left from the manufacturing process. I have had all my mercury filled teeth removed and completed a heavy metal detox programme, and didn't want to do that again.

Yellow fever is by far more dramatic than flu and so you have done right to have the vaccine. You can have peace of mind that you are now immune to that life threatening illness.
The sunshine you will get will help you through our long winter by giving you vitaminD
Enjoy your holiday - it will boost your immune system simply by going there