I'm with you, I'm not sure what would require an IV short of dehydration or drugs, neither of which would be necessary from a bad
scratch (in these times when supplies are rought), but I'm no doctor.
I also don't want to think
Tanya is just trying shit and hiding it from
Michael, but she has ALWAYS lied to him a little bit, right? She knew
Saul was the injured and her son, but didnt tell Michael, just went with him to
the tower. She lied about the 'scratch' she has, she actively asked michael previously if she could do some experiment back at the tower...etc. I don't want to paint tanya in a negative light, but I think she has her own beliefs on the outbreak and doesn't want to build anyones hopes up until she has some certainty. She's been analyzing the outbreak since we met her.