How should the timing of PPD testing be coordinated with smallpox vaccinations?
As with other live vaccines, tuberculin skin testing can be done before or on the same day as smallpox vaccination, but PPD testing should be deferred at least 4 weeks after smallpox vaccination. In other words you can give the PPD before or on the same day, but if you have already given the smallpox vaccine, you have to wait 4-6 weeks to give the PPD.
