An off Support build focused on debuffing. While not a great medic, they can help ensure a team lives a long life by using EMT for granting bonus health which can reduce trauma inadvertently due to how it works, and using Poultice to effectively turn even early un-upgraded accessories into decent uses. And when they are upgrade, turning them into even more effective tools.
Carry defibs, as you lack use speed. Your DPS should be serviceable, and with knowledge is power you'll be able to make better informed decisions based on the special infected you encounter.