Oh dear. IDK if this is relevant, but it may help, whenever I travel, I start taking Airborne, or Elderberry Emergen C for 3 days before boarding, and 3 days after I land, on arrival and exit. The couple who own Aubergine and Crown & Colony Antiques told me, when I worked there, that that is their trick to keep well on their every-3-month trips to the French and Italian markets to stock their shops.