Immunization Rules (Connecticut)

Last Modified on 12/16/2024 9:46 am CST

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Health vaccines and their associated compliance listings are based on state guidelines. Vaccine requirements for Connecticut are hard-coded. The following information describes vaccine compliance rules as defined by the Connecticut Department of Public Health.

For more information on the creation, modification or deletion of vaccine compliances, see the Vaccines page.

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General Compliance

  • DTaP vaccine is not given on or after the 7th birthday and may be given for all doses in the primary series.
  • Tdap can be given in lieu of Td vaccine for children 7 years and older unless contraindicated. Tdap is only licensed for one dose.
  • Hib is not required for children 5 years of age or older.
  • Pneumococcal is required for all Pre-K and K students born on or after 1/1/2007 and less than 5 years of age.
  • Hepatitis A is required for all Pre-K and K students born on or after 1/1/2007.
  • Second MMR for school year 2012-2013 applies to all students in Grades K-12.

DTaP

Rule

Requirements

3 doses K-12

Compliant

Students are considered compliant when the following conditions have been met:

  • the student is in state grade: KH: Kindergarten, Half Day, KE: Kindergarten, Extended Day, KF: Kindergarten, Full Day, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12,
  • the student receives three doses of the DT, Td, Tdap, or DTaP-DTP vaccine,
  • the difference between the first dose and the student's birthdate is greater than 84 months with a 4 day tolerance,
  • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance, and
  • the difference between the third dose and the previous is greater than 6 months with a 4 day tolerance.

4 doses K-12

Compliant

Students are considered compliant when the following conditions have been met:

  • the student is in state grade: KH: Kindergarten, Half Day, KE: Kindergarten, Extended Day, KF: Kindergarten, Full Day, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12,
  • the student receives four doses of the DT, Td, Tdap, or DTaP-DTP vaccine,
  • the difference between the last dose and the student's birthdate is greater than 48 months with a 4 day tolerance,
  • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance,
  • the difference between the third dose and the previous is greater than 28 days with a 4 day tolerance, and
  • the difference between the fourth dose and the previous is greater than 6 months with a 4 day tolerance.

4 doses

Compliant

Students are considered compliant when the following conditions have been met:

  • the student is at least 18 months old,
  • the student receives four doses of the DT, Td, Tdap, or DTaP-DTP vaccine,
  • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance,
  • the difference between the third dose and the previous is greater than 28 days with a 4 day tolerance, and
  • the difference between the fourth dose and the previous is greater than 6 months with a 4 day tolerance.

3 doses

Compliant

Students are considered compliant when the following conditions have been met:

  • the student is at least 7 months, but no older than 17 months old, and
  • the student receives three doses of the DT, Td, Tdap, or DTaP-DTP vaccine.

2 doses

Compliant

Students are considered compliant when the following conditions have been met:

  • the student is at least 5 months, but no older than 6 months old, and
  • the student receives two doses of the DT, Td, Tdap, or DTaP-DTP vaccine.

1 dose

Compliant

Students are considered compliant when the following conditions have been met:

  • the student is at least 3 months, but no older than 4 months old, and
  • the student receives one dose of the DT, Td, Tdap, or DTaP-DTP vaccine.

No Requirement

Students age 0-2 months old are not required to receive any doses of the DT, Td, Tdap, or DTaP-DTP vaccine.

Tdap

Rule

Requirements

1 dose Tdap

Compliant

Students are considered compliant when the following conditions have been met:

  • the student is in state grade: 07, 08, 09, 10, 11, 12,
  • the student receives one dose of the Tdap or DTaP-DTP vaccine, and
  • the difference between the dose and the student's birthdate is greater than 84 months with a 4 day tolerance.

Preschool - Grade 6

No Requirement

Students in state grades: P3: 3 year old Pre-K, KH: Kindergarten, Half Day, KE: Kindergarten, Extended Day, Full Day, 01, 02, 03, 04, 05, 06, are not required to receive any doses of the Tdap or DTaP-DTP vaccine.

Hepatitis B

Rule

Requirements

3 doses

Compliant

Students are considered compliant when  the following conditions have been met:

  • the student receives three doses of the Hepatitis B (Hep B) vaccine,
  • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance,
  • the difference between the third dose and the second valid dose is greater than 56 days with a 4 day tolerance,
  • the difference between the third dose and the two doses previous is greater than 112 days with a 4 day tolerance, and
  • the difference between the third dose and the student's birthdate is greater than 168 days with a 4 day tolerance.

2 doses 

In Progress

The student is considered in progress when the following conditions have been met:

  • the student receives two doses of the Hepatitis B vaccine, and
  • the difference between the second dose and the effective date is less than or equal to 56 days with a 0 (zero) day tolerance.

1 dose

In Progress

The student is considered in progress when the following conditions have been met:

  • the student receives 1 dose of the Hepatitis B vaccine, and
  • the difference between the dose and the effective date is less than or equal to 28 days with a 0 day tolerance.

Meningococcal

Rule

Requirements

1 dose grades 7-12 

Compliant

The student is considered compliant when the following conditions have been met:

  • the student receives 1 dose of the Meningococcal (MCV4 or MenACWY) vaccine, and
  • the student is in state grade 07, 08, 09, 10, 11, 12.

Default 7-12 Non-Compliant

The student is considered non-compliant if they are in State Grades 07, 08, 09, 10, 11, 12 and has not received any doses of the Meningococcal (MCV4 or MenACWY) vaccine.

MMR

Rule

Requirements

2 MMR K-12

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is in state grade: KH: Kindergarten, Half Day, KE: Kindergarten, Extended Day, KF: Kindergarten, Full Day, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12,
  • the student receives two doses of the Measles-Mumps Rubella (MMR) or Measles-Mumps-Rubella-Varicella (MMRV) vaccine,
  • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance, and
  • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance.

2M2M2R K-12

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is in state grade: KH: Kindergarten, Half Day, KE: Kindergarten, Extended Day, KF: Kindergarten, Full Day, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12,
  • the student receives two doses of the Measles vaccine,
    • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance, and
    • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance, 
  • the student receives two doses of the Mumps vaccine,
    • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance, and
    • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance, 
  • the student receives two doses of the Rubella vaccine,
    • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance, and
    • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance.

1MMR1M1M1R K-12

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is in state grade: KH: Kindergarten, Half Day, KE: Kindergarten, Extended Day, KF: Kindergarten, Full Day, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12,
  • the student receives one dose of the Measles vaccine,
    • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance, OR
  • the student receives one dose of the Mumps vaccine,
    • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance, OR
  • the student receives one dose of the Rubella vaccine,
    • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance, OR
  • the student receives two doses of the Measles, Measles-Mumps Rubella (MMR) or Measles-Mumps-Rubella-Varicella (MMRV) vaccine,
    • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance, and
    • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance, OR
  • the student receives two doses of the Mumps, Measles-Mumps Rubella (MMR) or Measles-Mumps-Rubella-Varicella (MMRV) vaccine,
    • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance, and
    • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance, OR
  • the student receives two doses of the Rubella, Measles-Mumps Rubella (MMR) or Measles-Mumps-Rubella-Varicella (MMRV) vaccine,
    • the difference between the first dose and the student's birthdate is greater than 12 months with a4 day tolerance, and
    • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance.

1 dose 16 months

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is at least 16 months old,
  • the student receives one dose of the Measles-Mumps Rubella (MMR) or Measles-Mumps-Rubella-Varicella (MMRV) vaccine, and
  • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance.

1M1M1R

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is at least 16 months old,
  • the student receives one dose of the Measles vaccine,
    • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance, OR
  • the student receives one dose of the Mumps vaccine,
    • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance, OR
  • the student receives one dose of the Rubella vaccine,
    • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance.

Age 0-15 months

No requirement

Students age 0-15 months old are not required to receive any doses of the Measles-Mumps Rubella (MMR) or Measles-Mumps-Rubella-Varicella (MMRV) vaccine.

Varicella

Rule

Requirements

2 doses 7-12

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is in state grade: 07, 08, 09, 10, 11, 12,
  • the student receives two doses of the Varicella or Measles-Mumps-Rubella-Varicella (MMRV) vaccine, and
  • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance 
  • the difference between the first dose and the student's birthdate is greater than 156 months with a 4 day tolerance,

2 doses

Compliant

The student is considered compliant when the following conditions have been met:

  • the student receives two doses of the Varicella or Measles-Mumps-Rubella-Varicella (MMRV) vaccine, and
  • the difference between the second dose and the previous is greater than 3 months with a 4 day tolerance, and
  • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance.

Ages 0-18 months

No Requirement

Students age 0-18 months old are not required to receive any doses of the Varicella or Measles-Mumps-Rubella-Varicella (MMRV) vaccine.

1 dose ages 19 months and older

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is at least 19 months old,
  • the student receives one dose of the Varicella or Measles-Mumps-Rubella-Varicella (MMRV) vaccine, and
  • the difference between the first dose and the student's birthdate is greater than 12 months with a 4 day tolerance.

Polio

Rule

Requirements

3 doses K-12

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is in state grade: KH: Kindergarten, Half Day, KE: Kindergarten, Extended Day, KF: Kindergarten, Full Day, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12,
  • the student receives three doses of the IPV, OPV, or IPV/OPV Polio vaccine,
  • the difference between the first dose and the student's birthdate is greater than or equal to 42 days with a 4 day tolerance,
  • the difference between the last dose and the student's birthdate is greater than 48 months with a 4 day tolerance,
  • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance, and
  • the difference between the third dose and the previous is greater than 28 days with a 4 day tolerance.

3 doses Ages 18 months and older

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is at least 18 months old,
  • the student receives three doses of the IPV, OPV, or IPV/OPV Polio vaccine,
  • the difference between the first dose and the student's birthdate is greater than or equal to 42 days with a 4 day tolerance,
  • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance, and
  • the difference between the third dose and the previous is greater than 28 days with a 4 day tolerance.

2 doses Ages 5 - 17 months

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is at least 5 months, but no older than 17 months old,
  • the student receives two doses of the IPV, OPV, or IPV/OPV Polio vaccine,
  • the difference between the first dose and the student's birthdate is greater than or equal to 42 days with a 4 day tolerance, and
  • the difference between the second dose and the previous is greater than 28 days with a 4 day tolerance.

1 dose Ages 3 - 4 months

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is at least 3 months, but no older than 4 months old,
  • the student receives one dose of the IPV, OPV, or IPV/OPV Polio vaccine, and
  • the difference between the first dose and the student's birthdate is greater than or equal to 42 days with a 4 day tolerance.

0-2 months

No Requirements

Students age 0-2 months old are not required to receive any doses of the Polio vaccine.

Pneumococcal

Rule

Requirements

Ages 0-2 months

No Requirement

Students age 0-2 months old are not required to receive any doses of the Pneumococcal PPV or PCV vaccine.

Grades K-12

No Requirement

Students age 60 months (5 years) old or older in state grade: KH: Kindergarten, Half Day, KE: Kindergarten, Extended Day, KF: Kindergarten, Full Day, 01, 02, 03, 04, 05, 06, 08, 09, 10, 11, 12, are not required to receive any doses of the Pneumococcal PPV or PCV vaccine.

1 dose Ages 3-4 months

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is at least 3 months, but no older than 4 months old, and
  • the student receives one dose of the Pneumococcal PPV or PCV vaccine.

2 doses Ages 5 months - 6 months

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is at least 5 months, but no older than 6 months old, and
  • the student receives two doses of the Pneumococcal PPV or PCV vaccine.

2 doses Ages 7 months - 15 months

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is at least 7 months, but no older than 15 months old, and
  • the student receives three doses of the Pneumococcal PPV or PCV vaccine.

1 dose after 1st birthday for children less than 5

Compliant

The student is considered compliant when the following conditions have been met:

  • the student receives one dose of the Pneumococcal PPV or PCV vaccine, and
  • the difference between the dose and the student's birthdate is greater than 12 months with a 4 day tolerance.

HIB

Rule

Requirements

Age 5 yrs and older

No requirement

Students 60 months (5 years) old and older are not require to receive any doses of the Haemophilus influenza, type B (Hib) vaccine.

1 dose after 1st birthday for children less than 5

Compliant

The student is considered compliant when the following conditions have been met:

  • the student receives one dose of the Haemophilus influenza, type B (Hib) vaccine, and
  • the difference between the dose and the student's birthdate is greater than 12 months with a 4 day tolerance.

Hepatitis A

RuleRequirements
Grade 9-12 20-21
No Requirement
Active Start Date: 07/01/2020
Active End Date: 06/30/2021		Students in state grade(s): 09, 10, 11, 12 are not required to receive any doses of the Hepatitis A vaccine.
Grade 10-12 21-22
No Requirement
Active Start Date: 07/01/2021
Active End Date: 06/30/2022		Students in state grade(s): 10, 11, 12 are not required to receive any doses of the Hepatitis A vaccine.
Grade 11-12 22-23
No Requirement
Active Start Date: 07/01/2022
Active End Date: 06/30/2023		Students in state grade(s): 11, 12 are not required to receive any doses of the Hepatitis A vaccine.
Grade 12 23-24
No Requirement
Active Start Date: 07/01/2023
Active End Date: 06/30/2024		Students in state grade(s): 12 are not required to receive any doses of the Hepatitis A vaccine.
2 year and older, born before 01/01/2007
No Requirement
Birth End Date: 12/31/2006		Students born before 01/01/2007 and at least 24 months old are not required to receive any doses of the Hepatitis A vaccine.
0-11 months
No Requirements		Students age 0-11 months old are not required to receive any doses of the Hepatitis A vaccine.
2 doses
Compliant		Students are considered compliant when the following conditions have been met:
  • the student receives two doses of Hepatitis A vaccine, 
  • the difference between the last dose and the previous is greater than 6 months with a 4 day tolerance, and
  • the difference between the first dose and the student's birthdate is greater than 12 months.
1 dose
In Progress		Students are considered in progress when the following conditions have been met:
  • the student receives one dose of the Hepatitis A vaccine, and
  • the difference between the last dose and the effective date is less than 6 months with a 4 day tolerance.

Influenza

Rule

Requirements

No dose current year 

Non-compliant

The student is considered non-compliant when the following conditions have been met:

  • the student is in state grade: P3: 3 year old Pre-K, PK: Prekindergarten, 
  • the student is at least 24 months, but no older than 59 months old,
  • the student receives one dose of the Influenza vaccine, and
  • the difference between the last dose and effective date greater than or equal to 11 months with a 0 (zero) day tolerance.

2 doses 

Compliant

The student is considered compliant when the following conditions have been met:

  • the student is in state grade: P3: 3-year-old Pre-K, PK: Prekindergarten, 
  • the student is at least 24 months, but no older than 59 months old,
  • the student receives two doses of the Influenza vaccine, 
  • the difference between the second dose and the previous is greater than 28 days with a 4-day tolerance, and
  • the difference between the last dose and the effective date is less than 6 months with a 1-day tolerance.
Default ages 24-59 months
Non-compliant		The student is considered non-compliant when the following conditions have been met:
  • the student is at least 24 months, but no older than 59 months old,
  • the student is in state grade(s): P3: 3 year old Pre-K, PK: Prekindergarten, and
  • the student has not received any doses of the Influenza vaccine.

Previous Versions

Immunization Rules (Connecticut) [.2335 - .2343]
Immunization Rules (Connecticut) [.2311 - .2331]
Immunization Rules (Connecticut) [.2307]
Immunization Rules (Connecticut) [.2303 and previous]

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