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QUESTION: A 16-year-old refugee's record indicates 2 doses of Td separated by 1 month and 1 dose of Tdap given 4 months after the second Td. Is he up to date?
ANSWER: The first two doses of Td are valid because they are separated by at least 4 weeks. However, the minimum interval between the second and third doses of tetanus-containing vaccine is 6 calendar months. So, the Td component of the Tdap dose is not valid because it was given only 4 months after the second dose. The pertussis component can be counted as valid. The patient should receive another dose of Td 6 months after the invalid Tdap dose. If Td is not available, Tdap can be used for this dose.
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This page was updated on May 17, 2017.
This page was reviewed on January 20, 2017.
 
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