When I had mine, they did a pertussis control and I reacted very badly to it. The nurse brushed me off when I called. When I went in a couple days later to have the tb test read, she noticed my hives and swollen arm and apologized. Turns out the control contained multiple things to which I'm rather horribly allergic to. (And yes, I DID ask her to check the label for these things. After that, I've read all injectable ingredients before they go in my body.)