My husband and I will be honeymooning in BsAs in early September. We are considering a trip to Iguazu Falls, but have a question about the Yellow Fever vaccine.

We know the vaccine is "recommended," but at $90 a pop, is it really necessary given the risk is very low? Any comments/opinions?

The vaccine is pretty reliable (nearly 100% effective for ten years), but has a nasty side effect for folks > 60 yo and folks with "thymus" problems - a YF like reaction with a high mortality.
That said, I was immunized in 1973, but not when I went to the Darien (Pananma) in 2003. We used Ultrathon and were not bothered by mosquitoes during the latter adventure.
M

Not neccesary at all !
Been many times in Iguazú falls , never herd people or tourists took any vac. !!
Don´t worry be happy.
Water only bottled,1 brand, only precaution.

"Water only, one brand" Which brand? Is this true in other parts of SA - We'll be in Bariloche, BA, Rio, Santiago, etc.

I am a fan of Villavicencio, but I do not know if it is available out of Argentina.

I do not quite understand why my nephew santiagov says "1 brand". Simply drink any well-known mineral water.

Sorry , meant first brand.

You won't need a vaccine for Yellow Fever for visiting Iguazu.
Just go and enjoy!!