I'm told some South American countries want to see your vaccine card for yellow fever (and maybe for other stuff that I don't know about) when you are entering their country from another South American country. I think this card is called vaccine yellow book.
Is it ok if I take a picture of this card and show them on my phone? Does the card have to be physical?
Also which vaccines do I need to be safe in South America other than covid19? I'm planning to extensively travel SA. Last time I was there I had some weird/unusual acne(or rash? idk) on me even though I was in urban areas