Actually, I'm starting to think CJ is right about the medicins in Saul's blood. It would make sense for Tanya to be on a IV as well, easy to cover up underneath some clothes.
Also because this might jumpstart some experiments with antibiotics and Ground Zero.

Although I understand Vicky for freaking out, I still think it's strange he's so suspicious of Saul.
Maybe Tanya experimented on some more people at the colony, people Victor didn't trust?
Maybe he has seen this before. He was pretty sure Saul would be able to breath the entire way.