Appendix A

A

Appendix A-15

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.h

IF current 

age is

AND # of 

previous 

doses of 

DTaP, DT, Td, 

or Tdap is

AND AND AND THEN Next dose due

7 through 

9 years1

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 

Dose 2 was Tdap1 Give Dose 3 (Td 

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

at least 6 calendar months 

after Dose 3 No dose was Tdap Give Dose 3 

(Tdap) today

It has not been

 4 weeks since 

Dose 2

Dose 2 was Tdap No dose today Give Dose 3 (Td or Tdap) at 

least 4 weeks after Dose 2

No dose was Tdap 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) today Give Tdap at 11–12 years 

of age1,2

No dose was Tdap 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 21

No dose was Tdap No dose today

Give Dose 3 (Tdap) 

at least 6 calendar months 

after Dose 2

1

For persons 7-9 years of age who receive a dose of Tdap, the routine adolescent Tdap dose should be administered at age 11-12.

2

Tdap may be administered regardless of the interval since the last tetanus- and diphtheria-toxoid-containing vaccine.

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.

Catch-Up Guidance for Children

7 through 9 Years of Age

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

A

Appendix A-16

Revised February 2021

Catch-Up Guidance for Children

7 through 9 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

7 through 

9 years1

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) today Give Tdap at 

11–12 years of age1,2

No dose was Tdap 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 31

No dose was Tdap No dose today 

Give Dose 4 (Tdap) at least 

6 calendar months 

after Dose 31

Dose 1 was 

given at 

12 months 

of age or older

No dose 

was Tdap  Give Dose 4 

(Tdap) today 2

Give Tdap at 

11–12 years of age1,2

Any dose 

was Tdap

 No dose today

Give Tdap at 

11–12 years of age1,2 

4 

Dose of DTaP or 

Tdap given after 

4th birthday 

 No dose today Give Tdap at 

11–12 years of age1,2 No DTaP or Tdap 

given after 

4th birthday

 Give a dose of 

Tdap today

1

For persons 7-9 years of age who receive a dose of Tdap, the routine adolescent Tdap dose should be administered at age 11-12.

2

Tdap may be administered regardless of the interval since the last tetanus- and diphtheria-toxoid-containing vaccine.

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