Browse by topic
I received the Varicella vaccination today. I know I can get...
I received the Varicella vaccination today. I know I can get the TB test done without it hurting the results, is this still true if I need the 2-Step TB?
The Varicella vaccine is a live vaccine. A TB test can be done before or on the same day that a live virus vaccine is given. However, if a live vaccine is given on the previous day or earlier, the TB test should be delayed for at least 4 weeks (28 days). If a live vaccine is given before the TB test, it can reduce the reactivity of the skin test because of mild suppression of the immune system and result in a false negative. If you need a 2nd dose of varicella, it can be given on the same day as the 2nd step TST. For further questions, please contact your immunization provider.