Core Principles Of Catch-Up Immunization
- Missed immunization requires no restarting of entire vaccine series due to robust immune memory.
- Resume interrupted schedule exactly from point of interruption.
- Multiple vaccines remain permissible on same day via separate injection sites spaced 2.5 centimeters apart.
- Maintain minimum 4-week interval between live injectable vaccines if not administered simultaneously.
- Inactivated vaccines remain permissible at any interval with live or other inactivated formulations.
Management Of Unknown Status
- Treat child possessing unknown immunization status as completely unimmunized.
- Initiate age-appropriate catch-up vaccination schedule immediately.
- Reject self-reported undocumented vaccine doses, excluding influenza and pneumococcal polysaccharide vaccines.
- Serologic testing remains not cost-effective, reduces compliance, and causes missed vaccination opportunities.
Rules For Preponed And Invalid Doses
- Count doses administered up to 4 days prior to minimum interval as valid.
- Reject doses administered 5 or more days before minimum recommended interval.
- Repeat invalid live virus vaccine doses at least 4 weeks following expired or invalid dose.
- Repeat invalid inactivated vaccine doses as soon as possible.
Vaccine-Specific Age Limits And Catch-Up Schedules
| Vaccine | Maximum Age And Catch-Up Guideline |
|---|
| Bacillus Calmette-Guerin | Administer up to 5 years; pre-vaccination Mantoux test remains not recommended. |
| Oral poliovirus vaccine | Administer up to 5 years; provide three doses 4 weeks apart. |
| Diphtheria-tetanus-pertussis | Administer up to 7 years; provide three doses at 0, 1, and 6 months. |
| Hemophilus influenzae type b | Administer up to 5 years in healthy children; recommended beyond 5 years exclusively for high-risk groups. |
| Pneumococcal conjugate vaccine | Administer up to 5 years in healthy children; recommended beyond 5 years exclusively for high-risk groups. |
| Rotavirus vaccine | Maximum age for first dose comprises 14 weeks 6 days; maximum age for final dose comprises 8 months. |
| Typhoid conjugate vaccine | Administer up to 18 years; provide single intramuscular dose. |
| Measles-mumps-rubella | Administer up to 5 years routinely; previously unimmunized older children require two doses 4 weeks apart. |
| Hepatitis B vaccine | Administer at any age; provide three doses at 0, 1, and 6 months. |
Catch-Up Immunization Beyond Seven Years
- Diphtheria-tetanus-pertussis vaccines remain strictly contraindicated beyond 7 years due to increased reactogenicity.
- Substitute whole-cell vaccines with tetanus-diphtheria-acellular pertussis vaccine or tetanus-diphtheria vaccine.
- Unimmunized children above 7 years require three doses of tetanus-containing vaccines administered at 0, 1, and 6 months.
- Administer tetanus-diphtheria-acellular pertussis for initial catch-up dose.
- Administer tetanus-diphtheria formulation for second and third catch-up doses.
- Administer Varicella vaccine in two doses spaced 3 months apart for children under 13 years, or 4 weeks apart for older adolescents.
