Appendix A

A

Appendix A-17

Catch-Up Guidance for Children

10 through 18 Years of Age

Tetanus-, Diphtheria-, and Pertussis-Containing Vaccines: Tdap/Td1 

IF current 

age is

AND # of 

previous 

doses of 

DTaP, DT, Td, 

or Tdap is

AND AND AND THEN Next dose due

10 through 

18 years

Unknown or 0    Give Dose 1 

(Tdap) today

Give Dose 2 (Td or Tdap) at 

least 4 weeks after Dose 1

1

Dose 1 was 

given before

12 months 

of age 

  Give Dose 2 

(Tdap) today

Give Dose 3 (Td or Tdap) at 

least 4 weeks after Dose 2

Dose 1 was 

given at 

12 months of 

age or older 

It has been at 

least 4 weeks 

since Dose 1

Dose 1 was Tdap Give Dose 2 (Td 

or Tdap) today Give Dose 3 (Td or Tdap) 

at least 6 calendar months 

Dose 1 was after Dose 2

not Tdap

Give Dose 2 

(Tdap) today 

It has not been

 4 weeks since 

Dose 1

Dose 1 was Tdap No dose today Give Dose 2 (Td or Tdap) at 

least 4 weeks after Dose 1

Dose 1 was 

not Tdap No dose today Give Dose 2 (Tdap) at least 

4 weeks after Dose 1

2

Dose 1 was 

given before

12 months 

of age

It has been at 

least 4 weeks 

since Dose 2 

Any dose 

was Tdap1

Give Dose 3 (Td 

or Tdap) today2 Give Dose 4 (Td or Tdap) 

at least 6 calendar months 

No dose was Tdap3 Give Dose 3 after Dose 3

(Tdap) today

It has not been

 4 weeks since 

Dose 2

Any dose 

was Tdap1 No dose today Give Dose 3 (Td or Tdap) at 

least 4 weeks after Dose 22

No dose was Tdap3 No dose today Give Dose 3 (Tdap) at least 

4 weeks after Dose 2 

Dose 1 was 

given at 

12 months of 

age or older

It has been at 

least 6 calendar 

months since 

Dose 2

Any dose 

was Tdap1

Give Dose 3 (Td 

or Tdap) today2 Give Td or Tdap 10 years 

after Dose 3

No dose was Tdap2 Give Dose 3 

(Tdap) today

It has not been 

6 calendar 

months since 

Dose 2 

Any dose 

was Tdap1 No dose today

Give Dose 3 (Td or Tdap) 

at least 6 calendar months 

after Dose 22

No dose was Tdap3 No dose today

Give Dose 3 (Tdap) at least 

6 calendar months 

after Dose 2

1

Given at 10 years of age or older.

2If the previous Tdap dose(s) was administered before the 10th birthday, then a dose of Tdap is recommended now. 

3

Or Tdap administered at 9 years of age or younger.

Reference: Recommended Child and Adolescent Immunization Schedule for Ages 18 Years or Younger—United States, 2021.

www.cdc.gov/vaccines/schedules/downloads/child/0-18yrs-child-combined-schedule.pdf

The table below provides guidance for children whose vaccinations have been delayed . Start with the child’s age and 

information on previous doses (previous doses must be documented and must meet minimum age requirements and 

minimum intervals between doses) . Use this table in conjunction with table 2 of the Recommended Child and Adolescent Immunization Schedule for Ages 18 Years or Younger, found at 

www .cdc .gov/vaccines/schedules/hcp/child-adolescent .html .
Appendix A

A

Appendix A-18

Catch-Up Guidance for Children

10 through 18 Years of Age 

Tetanus-, Diphtheria-, and Pertussis-Containing Vaccines: Tdap/Td1 

IF current age 

is

AND # of 

previous 

doses 

of DTaP, 

DT, Td, or 

Tdap is

AND AND AND THEN Next dose due

10 through 

 18 years

3

Dose 1 was

 given before

12 months of age 

It has been at 

least 6 calendar 

months since 

Dose 3 

Any dose was 

Tdap1

Give Dose 4 

(Td or Tdap) 

today2 Give Td or Tdap 10 years 

after Dose 4 

No dose was 

Tdap3

Give Dose 4 

(Tdap) today

It has not been 

6 calendar 

months since 

Dose 3 

Any dose was 

Tdap1 No dose today 

Give Dose 4 (Td or Tdap) 

at least 6 calendar months 

after Dose 32

No dose was 

Tdap3 No dose today 

Give Dose 4 (Tdap) at least 

6 calendar months 

after Dose 3

Dose 1 was 

given at 

12 months of age 

or older

No dose was 

Tdap1  Give Dose 4 

(Tdap) today 

Give Td or Tdap 10 years 

after Dose 4

Any dose

 was Tdap2  No dose today Give Td or Tdap 10 years 

after Dose 3

4 

No Tdap was 

given after 7th

birthday



Give a dose of 

Tdap today4

Give Td or Tdap 10 years 

after Tdap dose

Any dose of Tdap 

was given at age 

7 years or older1

No Tdap was 

given after 10th

birthday

Tdap was 

given after 10th

birthday No dose today Give Td or Tdap 10 years

after Dose 4

1

Given at 10 years of age or older.

2

If the previous Tdap dose(s) was administered before the 10th birthday, then a dose of Tdap is recommended now. 

3

Or Tdap administered at 9 years of age or younger.

4

The preferred age at administration for this dose is 11–12 years. However, if Tdap is administered at age 10 years, the Tdap dose may count as the adolescent Tdap dose. 

Reference: Recommended Child and Adolescent Immunization Schedule for Ages 18 Years or Younger—United States, 2021.

www.cdc.gov/vaccines/schedules/downloads/child/0-18yrs-child-combined-schedule.pdf