Marshall Co. clinic discusses role of primary care providers in getting people vaccinated against coronavirus According to a study published by the Robert Graham Center, primary care physicians are key when it comes to getting people vaccinated against the coronavirus. Posted: Apr 22, 2021 5:52 PM Posted By: Sierra Phillips According to a study published by the Robert Graham Center, primary care physicians are key when it comes to getting people vaccinated against the coronavirus. We spoke with nurse practitioner Tray NeSmith at Marshall Primary Care in Arab. He explained that his patients have expressed concerns and asked for counsel to decide if they want to get the coronavirus vaccine.