Contagionists: believe disease is transmitted by transfer of goods being shipped from pestilent areas. They didn't really know how the contagions moved with the goods, but some thought it was by animalcules, or small creatures.
Anti-contagionists: believed disease spread through the air like miasma. Overcrowded hospitals and cities led to disease because filth was everywhere, and the rot would create spontaneous illnesses.
Now, if you two idiots could just work together, you would figure this out. You're both about half right.
So glad I live in a modern medical world. I'd have died a dozen times by now.