That's my assumption. Once you have it, you have antibodies to it as well, which prevent new cases. But you're still stuck with it in the original place, becaus

That's my assumption. Once you have it, you have antibodies to it as well, which prevent new cases. But you're still stuck with it in the original place, because the virus's genome hides out where the antibodies can't get it, then from time-to-time it decides to go on a rampage. IANAI (Immunologist)