TABLE 1. Recommended COVID-19 vaccination schedule for persons aged 6 months–4 years who are not moderately or severely immunocompromised,* by COVID-19 vaccination history — United States, September 2023.
| Previous COVID-19 vaccination history (before updated mRNA vaccine)† | Updated mRNA vaccine | No. of updated mRNA vaccine doses indicated | Interval between doses |
|---|---|---|---|
|
Unvaccinated
|
Moderna |
2 |
Dose 1 and dose 2: 4–8 wks |
| Pfizer-BioNTech |
3 |
Dose 1 and dose 2: 3–8 wks
Dose 2 and dose 3: ≥8 wks |
|
|
Received Moderna vaccine
| |||
| 1 dose any Moderna |
Moderna |
1 |
4–8 wks after last dose |
| ≥2 doses any Moderna |
Moderna |
1 |
≥8 wks after last dose |
|
Received Pfizer-BioNTech vaccine
| |||
| 1 dose any Pfizer-BioNTech |
Pfizer-BioNTech |
2 |
Dose 1: 3–8 wks after last dose
Dose 1 and dose 2: ≥8 wks |
| 2 doses any Pfizer-BioNTech |
Pfizer-BioNTech |
1 |
≥8 wks after last dose |
| ≥3 doses any Pfizer-BioNTech | Pfizer-BioNTech | 1 | ≥8 wks after last dose |
* Additional clinical considerations, including detailed schedules and tables by age and vaccination history for those who are and are not moderately or severely immunocompromised, are available. https://www.cdc.gov/vaccines/covid-19/clinical-considerations/covid-19-vaccines-us.html