Medications · LIVE

CDC catch-up immunization interval (ACIP)

Return the printed ACIP 2025 catch-up Table 2 minimum age and previous-dose interval for a caller-assigned antigen and dose, and whether that age and interval are met.

LIVE $0.005 USDC GET /api/calc/cdc_imm

Markdown: /docs/cdc-imm.md · Canonical: https://magentlab.com/docs/cdc-imm

Not a medical device. Not a diagnosis, dose, or listing recommendation.

What it computes

Return the printed ACIP 2025 catch-up Table 2 minimum age and previous-dose interval for a caller-assigned antigen and dose, and whether that age and interval are met.

When to use

When an agent already has a caller-assigned antigen, dose number, completed age in months, and weeks since the previous dose (omitted for dose 1) and needs the numeric catch-up Table 2 cell rather than the routine age bars or a vaccine order.

When not to use

Not a medical device. Not a vaccine order. magent does not immunize.
Catch-up Table 2 numeric minimum age and previous-dose interval cells only. Not the full routine schedule (Table 1) and not Table 3 medical-indication rows.
HepB dose 3 (8 weeks and 16 weeks after dose 1), Hib, PCV, rotavirus max ages, 6-month intervals, the 4-day grace period, and live-virus spacing beyond this table are not implemented.
DTaP is the 4-month-through-6-year section (age_months < 84). 6 weeks is stored as 1.5 months. Age is caller-assigned completed months; magent does not derive chronological age.

Formula

ACIP 2025 child/adolescent catch-up Table 2: eligible if age_months >= minimum_age_months and (dose 1 has no printed interval, or weeks_since_previous_dose >= minimum_interval_weeks). HepB dose 1 birth = 0 months; HepB dose 2 = 4 weeks. MMR dose 1 = 12 months; MMR dose 2 = 4 weeks. HepA and varicella dose 1 = 12 months. DTaP/IPV dose 1 = 6 weeks as 1.5 months; DTaP doses 2-3 and IPV dose 2 = 4 weeks (DTaP only when age_months < 84). Tdap dose 1 = 84 months. Not Table 1 routine bars. Not Hib, PCV, rotavirus, HepB dose 3, 6-month intervals, the 4-day grace period, or live-virus spacing beyond this table. magent does not immunize

Citation

Title: Advisory Committee on Immunization Practices Recommended Immunization Schedule for Children and Adolescents Aged 18 Years or Younger — United States, 2025
Authors: Issa AN, Wodi AP, Moser CA, Cineas S
Source: MMWR Morb Mortal Wkly Rep. 2025;74(2):26-29
DOI: 10.15585/mmwr.mm7402a2

Worked example

HepB dose 2 at 4 months, 4 weeks after dose 1: eligible

Given: age_months=4dose_number=2vaccine=hepbweeks_since_previous_dose=4

Table 2 Hepatitis B dose 1 to dose 2 minimum interval is 4 weeks
Minimum age for HepB dose 1 is birth (0 months); age 4 months meets it
weeks_since_previous_dose 4 >= 4 → eligible true

HepB dose 2 at 4 months, 3 weeks after dose 1: too soon

Given: age_months=4dose_number=2vaccine=hepbweeks_since_previous_dose=3

Table 2 Hepatitis B dose 1 to dose 2 minimum interval is 4 weeks
Age 4 months meets the birth minimum
weeks_since_previous_dose 3 < 4 → eligible false

HepB dose 1 at 4 months: no previous-dose interval

Given: age_months=4dose_number=1vaccine=hepb

Table 2 Hepatitis B dose 1 minimum age is birth (0 months)
Dose 1 has no printed previous-dose interval
age 4 months >= 0 and interval not applicable → eligible true

Also searched as

CDC catch-up immunization
ACIP catch-up schedule
hepatitis B minimum interval
MMR minimum age
catch-up vaccine interval
Table 2 catch-up

Try

Opens the live endpoint. Unpaid browser requests show the paywall; agents should send Accept: application/json.

/api/calc/cdc_imm?vaccine=hepb&dose_number=2&age_months=4&weeks_since_previous_dose=4

Full URL: https://api.magentlab.com/api/calc/cdc_imm?vaccine=hepb&dose_number=2&age_months=4&weeks_since_previous_dose=4

Call

Expect HTTP 402 until you retry with PAYMENT-SIGNATURE. Incomplete query params return HTTP 400 before any quote or charge.

curl -i -H "Accept: application/json" "https://api.magentlab.com/api/calc/cdc_imm?vaccine=hepb&dose_number=2&age_months=4&weeks_since_previous_dose=4"

Parameters

Name	Type	Required	Description
`vaccine`	string	required · hepb, mmr, dtap, ipv, hepa, var, tdap	Caller-assigned antigen with a numeric Table 2 minimum age and/or previous-dose interval: hepb, mmr, dtap, ipv, hepa, var, or tdap. Not a vaccine order.
`dose_number`	integer	required	Dose number in the series as printed (integer 1-5). Only rows with a numeric minimum age and/or interval are implemented; other dose numbers are rejected.
`age_months`	integer	required	Caller-assigned completed age in months (integer 0-216; 18 years or younger). magent does not derive chronological age.
`weeks_since_previous_dose`	integer	optional	Whole weeks since the previous dose (integer 0-520). Required for dose 2 and later. Must be omitted for dose 1 as Table 2 prints no previous-dose interval.

Bulk (POST)

POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement.

POST /api/calc/cdc_imm Max 25 unit_amount + extra_item_amount * (n - 1) extra $0.002 PREVIEW

1 to 25 items. Each item uses the same keys as the GET query parameters.
POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows.
The first invalid item fails the whole request (index in the 400 JSON). You are not charged.
HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row.
Catalog misses (empty matches, found=false) stay paid 200s inside that slot.
x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items.

Example request (fixture)

{
  "items": [
    {
      "age_months": "4",
      "dose_number": "2",
      "vaccine": "hepb",
      "weeks_since_previous_dose": "4"
    },
    {
      "age_months": "4",
      "dose_number": "2",
      "vaccine": "hepb",
      "weeks_since_previous_dose": "4"
    }
  ]
}

Open bulk paywall →

Opens a two-item fixture on the API host. Unpaid browsers get the same MetaMask paywall as GET; Pay retries POST with those items.

Example 200 (fixture)

{
  "count": 2,
  "path": "/api/calc/cdc_imm",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "age_met",
          "met": true
        },
        {
          "value": 4,
          "factor": "interval_met",
          "met": true
        }
      ],
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Issa AN, Wodi AP, Moser CA, Cineas S",
        "doi": "10.15585/mmwr.mm7402a2",
        "id": "cdc-acip-catch-up-schedule",
        "pmid": "39819853",
        "source": "MMWR Morb Mortal Wkly Rep. 2025;74(2):26-29",
        "title": "Advisory Committee on Immunization Practices Recommended Immunization Schedule for Children and Adolescents Aged 18 Years or Younger — United States, 2025"
      },
      "formula": "cdc_imm",
      "formula_expression": "ACIP 2025 child/adolescent catch-up Table 2: eligible if age_months >= minimum_age_months and (dose 1 has no printed interval, or weeks_since_previous_dose >= minimum_interval_weeks). HepB dose 1 birth = 0 months; HepB dose 2 = 4 weeks. MMR dose 1 = 12 months; MMR dose 2 = 4 weeks. HepA and varicella dose 1 = 12 months. DTaP/IPV dose 1 = 6 weeks as 1.5 months; DTaP doses 2-3 and IPV dose 2 = 4 weeks (DTaP only when age_months < 84). Tdap dose 1 = 84 months. Not Table 1 routine bars. Not Hib, PCV, rotavirus, HepB dose 3, 6-month intervals, the 4-day grace period, or live-virus spacing beyond this table. magent does not immunize",
      "age_months": 4,
      "dose_number": 2,
      "eligible": true,
      "minimum_age_months": 0,
      "minimum_interval_weeks": 4,
      "vaccine": "hepb",
      "weeks_since_previous_dose": 4
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "age_met",
          "met": true
        },
        {
          "value": 4,
          "factor": "interval_met",
          "met": true
        }
      ],
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Issa AN, Wodi AP, Moser CA, Cineas S",
        "doi": "10.15585/mmwr.mm7402a2",
        "id": "cdc-acip-catch-up-schedule",
        "pmid": "39819853",
        "source": "MMWR Morb Mortal Wkly Rep. 2025;74(2):26-29",
        "title": "Advisory Committee on Immunization Practices Recommended Immunization Schedule for Children and Adolescents Aged 18 Years or Younger — United States, 2025"
      },
      "formula": "cdc_imm",
      "formula_expression": "ACIP 2025 child/adolescent catch-up Table 2: eligible if age_months >= minimum_age_months and (dose 1 has no printed interval, or weeks_since_previous_dose >= minimum_interval_weeks). HepB dose 1 birth = 0 months; HepB dose 2 = 4 weeks. MMR dose 1 = 12 months; MMR dose 2 = 4 weeks. HepA and varicella dose 1 = 12 months. DTaP/IPV dose 1 = 6 weeks as 1.5 months; DTaP doses 2-3 and IPV dose 2 = 4 weeks (DTaP only when age_months < 84). Tdap dose 1 = 84 months. Not Table 1 routine bars. Not Hib, PCV, rotavirus, HepB dose 3, 6-month intervals, the 4-day grace period, or live-virus spacing beyond this table. magent does not immunize",
      "age_months": 4,
      "dose_number": 2,
      "eligible": true,
      "minimum_age_months": 0,
      "minimum_interval_weeks": 4,
      "vaccine": "hepb",
      "weeks_since_previous_dose": 4
    }
  ]
}

Response

Field	Type	Description
`formula`	string	cdc_imm
`formula_expression`	string	Published ACIP 2025 Table 2 catch-up age and interval rule
`vaccine`	string	Caller-assigned antigen used
`dose_number`	integer	Dose number in the series
`age_months`	integer	Caller-assigned completed age in months
`weeks_since_previous_dose`	integer	Weeks since the previous dose, or null for dose 1
`minimum_age_months`	number	Printed minimum age in months for that antigen and dose
`minimum_interval_weeks`	integer	Printed previous-dose interval in weeks, or null for dose 1
`eligible`	boolean	True when age meets the printed minimum and a printed interval is met. Not a vaccine order.
`components`	array	Tree rows for age_met and interval_met with factor, met, and value
`citation`	object	Issa 2025 MMWR ACIP schedule citation
`disclaimer`	string	Not-a-device notice

Example JSON

Machine form of the same example. Frozen fixture. Not a live lookup.

{
  "components": [
    {
      "value": 0,
      "factor": "age_met",
      "met": true
    },
    {
      "value": 4,
      "factor": "interval_met",
      "met": true
    }
  ],
  "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
  "citation": {
    "authors": "Issa AN, Wodi AP, Moser CA, Cineas S",
    "doi": "10.15585/mmwr.mm7402a2",
    "id": "cdc-acip-catch-up-schedule",
    "pmid": "39819853",
    "source": "MMWR Morb Mortal Wkly Rep. 2025;74(2):26-29",
    "title": "Advisory Committee on Immunization Practices Recommended Immunization Schedule for Children and Adolescents Aged 18 Years or Younger — United States, 2025"
  },
  "formula": "cdc_imm",
  "formula_expression": "ACIP 2025 child/adolescent catch-up Table 2: eligible if age_months >= minimum_age_months and (dose 1 has no printed interval, or weeks_since_previous_dose >= minimum_interval_weeks). HepB dose 1 birth = 0 months; HepB dose 2 = 4 weeks. MMR dose 1 = 12 months; MMR dose 2 = 4 weeks. HepA and varicella dose 1 = 12 months. DTaP/IPV dose 1 = 6 weeks as 1.5 months; DTaP doses 2-3 and IPV dose 2 = 4 weeks (DTaP only when age_months < 84). Tdap dose 1 = 84 months. Not Table 1 routine bars. Not Hib, PCV, rotavirus, HepB dose 3, 6-month intervals, the 4-day grace period, or live-virus spacing beyond this table. magent does not immunize",
  "age_months": 4,
  "dose_number": 2,
  "eligible": true,
  "minimum_age_months": 0,
  "minimum_interval_weeks": 4,
  "vaccine": "hepb",
  "weeks_since_previous_dose": 4
}

Client errors (HTTP 400)

Invalid params return 400 without charge. Shared HTTP 402 and 503 meanings: Payments.

HTTP	Code	When
400	`invalid_cdc_imm`	CDC catch-up immunization inputs must match the printed vaccine, dose number, age, and interval columns. Returned before settlement; you are not charged.
400	`invalid_items`	POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
400	`invalid_item_count`	items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
400	`invalid_item`	each items entry must be a JSON object Returned before settlement; you are not charged.

Related tools

RhIG vials — Compute ACOG Practice Bulletin 181 RhD immune globulin vial count from caller-assigned fetal-cell percent and maternal blood volume using AABB Technical Manual rounding of FMH/30.

Payment

Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. Unpaid valid requests return HTTP 402 with a base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote: retry the same PAYMENT-SIGNATURE. Full handshake and shared payment errors: Payments. Stdio MCP: /docs/mcp.

Guarantees

HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON.
exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE.
HTTP 402 is unpaid only. Do not sign a second authorization because of a 503.
Execution is timeout-bounded and concurrency-capped.
Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.