This might work, even against a "well oiled machine":
1) For 3 days take excessive amounts of the herb Echinacia - it increases white cell count & raises core body temperature.
2) Stay awake for 36hrs before putting the plan into effect, using as little caffein as possible - makes you red-eyed & jittery without the obvious
signs of stimulants.
3) Make an emergency appointment to see your doctor.
4) On your way to the appointment, do some strenuous exercise - to make sure your temperature is high.
5) Shortly, but not immediately, before seeing your Doc, insufflate a small line of table salt into each nostril - will make your nose run badly &
your eyes water.
6) Lie to your Doc describing the onset of your "flu" - they'll give you some mild painkillers & decongestants etc.
Having had the disease, voila, you wont need a vaccination!
If you have access to cordite, apparently soldiers used to eat a small bit to make themselves look really ill to get out of duty... might work, IDK