I have been taking the PPD skin test atleast once a year since 1988. For the past six years my employer required it every 6 months.
In the past, after getting the injection, you couldn't even tell where the stick was. Never got red, hard, etc.
This past time when I got it, it got red immediately, and one week later it is still red and sore. It wasn't a positive result, not indurated.
What I'm wondering is: have I been tested so many times that my body is now developing an immune response to the vaccine? Is that possible?
Anyone else have this happen?