Many of you at home have asked in response to Governor Greg Gianforte testing positive if you can get COVID if youâve been vaccinated. It's important to note that the governor was vaccinated with the first dose last week. It takes some time before you develop full protection and immunity from COVID. The CDC says two weeks after the second dose in a two-dose series, for the Pfizer or Moderna vaccines, or two weeks after a single-dose vaccine, such as Johnson & Johnsonâs vaccine. Itâs rare that after people have received both doses to test positive, one study out of Chicago shows out of 392,000 vaccinated patients about 100 people tested positive after getting to the point of full protection.