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Temperature variations shouldn't impact your flu risk, but traveling generally will because you'll be exposed to more people (and recycled air, assuming you're flying.) If you need Official Vegan Dogma (TM) I can dig up the Vegan Society statement on taking needed medication, but my personal advice would be to make the thoughtful decision that's right for you and not feel like you have to defend yourself either way.
Personally, my son and I have a history of adverse reactions (and odd immune responses generally) but are quite healthy, so I've opted out of some of the jabs for lower-risk things (for example, my kid didn't have the chicken pox shot, and neither of us get flu shots) on the thinking that for us the likely benefit-risk ratio is substantially lower than average, and for relatively minor illnesses the risk may outweigh the benefits.
I wouldn't give the cultured-on-eggs thing any more weight than I would any other prescription medication, most of them are animal products to some degree (lactose based pills, gelatin capsules, glycerin liquid suspensions, etc) and all are required by law to be animal tested, so there really aren't readily available vegan alternatives, and you do have a responsibility to yourself to be healthy. So just make the best decision you can for yourself, and keep working to change the system. :)
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