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  • Varicella (Chickenpox)
  • Vaccine Recommendations

Does varicella vaccine affect tuberculosis skin test readings in the same way that MMR does?

There is currently no information on the effect of varicella vaccine on reactivity to a tuberculin skin test (TST). Until information is available, it is prudent to apply the same rules to varicella vaccine as are applied to MMR: a TST (i.e., PPD) may be applied before (preferably) or simultaneously with varicella vaccine. If vaccine has been given, delay the TST for at least 4 weeks.

Last reviewed: May 16, 2023

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