long haul flight

Hope you don’t mind me butting in but I came on the site for the first time for ages for some advice and this is nearest to my query!
I’m going to Ecuador and some of the trip is at altitude (about 5000m) - I can’t find out if this is the same as flying. Should I wear my sleeve when I’m trekking? What other precautions should I take?
And it’s a mosquito country (and dengue fever - great!) so the advice about the antibiotics is really helpful.Any advice or similar experience gratefully recieved! Thanks a lot x

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