Are any of the sites particularly red that got bitten Liesa, if one of the bites has got infected it may need antibiotics. Like Chris I was going to suggest that West Nile virus is on the increase in the US , more so than malaria. Has been for a while I think, our first trip 11 years ago as we got to checkin Virign gave us a leaflet at teh airport about it and saying that repellant should be used at dawn and dusk when they are most active, Boots at Gatwick did very well out of all the passengers going there. It is highly unlikely and as you say is more likely to be a bug than anything else as it is still very rare to get anything more serious.
If it was somethiong you had eaten it would probably have made you sick within a couple of hours.
Hope by the time you are reading this youre feeling better anyway.
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