I finally got my first Moderna vaccination on St. Patrick's day here in New Braunfels. I had the good fortune to draw an experienced nurse, instead of one of the EMTs. Injection was completely painless. That afternoon, I noticed some swelling, warmth, tenderness at the injection. Today, I have a little knot there, still noticeable tenderness. I suspect that I had an asymptomatic infection previously. What do you think?