# Source snapshot — us-measles-2026 story Retrieved **8 November 2026** by [`fetch.mjs`](fetch.mjs) (from the download folder: `node us-measles-2026-src/fetch.mjs`; no dependencies beyond Node). The raw files are archived here unchanged. [`calculate.mjs`](calculate.mjs) checks their SHA-256 against the values below, then writes the four CSVs and every number quoted in the post to `statistics.json`; `../us-measles-2026-make-charts.mjs` builds the desktop and `-mobile.svg` charts from them. CDC updates the case files weekly (this snapshot was published on Friday 6 November 2026, using reports through noon on Thursday 5 November), so a re-fetch changes them; update the hashes in `calculate.mjs` and here together, deliberately. ## CDC, Measles Cases and Outbreaks - **Publisher:** US Centers for Disease Control and Prevention (CDC), National Center for Immunization and Respiratory Diseases. Page: ("Updated on November 6, 2026"; data "as of November 5, 2026"). The JSON files are the data behind the page's charts, found through each chart's `data-config-url` (e.g. names `/wcms/vizdata/measles/MeaslesCasesHistory.json`). - **Kindergarten coverage:** CDC SchoolVaxView estimates, as served on the same page ("MMR vaccine coverage for kindergarteners by school year (2009–2026)"). Coverage definitions and state survey methods: . - **Licence:** CDC federal materials are generally in the public domain in the United States (17 U.S.C. § 105), subject to exceptions CDC identifies. CDC's [policy on agency materials](https://www.cdc.gov/other/agencymaterials.html) says most of its information "is in the public domain, and may be freely used or reproduced without obtaining copyright permission", and asks users to attribute CDC, not to change the substance, to state that the materials are available free on the agency website and to say that their use does not imply endorsement; the post does all four. PAHO announcements (below) are separately copyrighted contextual sources ([PAHO permissions and licensing](https://www.paho.org/en/publications/permissions-and-licensing)), cited and briefly quoted; no blanket open licence is asserted for them. | File | URL | Bytes | Upstream Last-Modified | SHA-256 | |------|-----|-------|------------------------|---------| | `MeaslesCasesHistory.json` | | 2,125 | Fri, 06 Nov 2026 10:58:45 GMT | `d67cae4a5e09dd9ecbb9172c34e08b17e0793d3b276e091f38ac20225ac285f1` | | `MeaslesCasesYear.json` | | 6,087 | Fri, 06 Nov 2026 10:59:07 GMT | `3a72404a2b2b203d00347c45ae96fd7394ac6fdaad0cdb18a0447fbb1d87e0e7` | | `MeaslesCasesWeekly.json` | | 16,674 | Fri, 06 Nov 2026 11:00:28 GMT | `db763ec19eefa6b9ca82f1a25e600034a115a9b42bc2b07c0dfcee63c5512127` | | `MeaslesCasesMap.json` | | 26,444 | Fri, 06 Nov 2026 10:59:54 GMT | `459a1448eb011f32cd4cfa2376db50f71bea5b7b34d048ecf01c8af595eab564` | | `measles_hosp.json` | | 1,872 | Fri, 06 Nov 2026 11:00:27 GMT | `4efdd9077f183f96b96fed80a5fcc856eaa1b6de9fc89ca1d0f3118153fa4841` | | `MeaslesKindergartenVaxcovExemptions.json` | | 240,735 | Tue, 18 Aug 2026 20:08:41 GMT | `1d06d23adbfb479f52b2ac0d448bf12219abec7eab55fa325ca01fd88acb416d` | | `measles-cases-and-outbreaks.html` | | 106,653 | (not sent) | `7bf86668b9a7d88ac4b709fa00dc8c88f8f82bb109d652fb71f64eb8285be1d4` | All case files carry `"lastUpdated": "November 05, 2026"`. The HTML page is archived because the outbreak counts, the outbreak definition and CDC's national kindergarten coverage figures appear only in its text; `calculate.mjs` extracts them by matching the exact sentences and fails if they change. ## Derived files (written by `calculate.mjs`) | File | Contents | Rows | SHA-256 | |------|----------|------|---------| | `annual-cases.csv` | `year, cases, provisional`, 1962–2026 | 65 | `6526ed3f6f59e641bc28903d2c4f65868ef73aa2e7d240e1e9a5b1beb4e6fb6f` | | `weekly-cases.csv` | `week_start, week_end, mmwr_year, mmwr_week, cases, cumulative`, 2 Jan 2022 to 7 Nov 2026 | 253 | `a0afd7e70b85e0e49a41ee7117e98fd1b1de893f98cb79ed9db1f65f3848ac04` | | `state-cases.csv` | `jurisdiction, cases_2024, cases_2025, cases_2026` (US residents) | 52 | `75d3ea2285be7b9331d71da202dd1eccbb3282cc541684d0f3d4a063e5eb55b8` | | `kindergarten-mmr-coverage.csv` | `school_year, geography, state, coverage_pct, population_size, percent_surveyed, survey_type` | 901 | `8806496cabaf9a963a2de838e81d3f46ef1b7e0eb41052a5b2a051e67577500d` | | `statistics.json` | Every number in the post, plus cross-checks | — | (regenerated; byte-identical across runs) | ## Context documents cited, not snapshotted - CDC, "History of Measles", (3 to 4 million infected each year before the 1963 vaccine; declared eliminated in 2000, meaning no continuous spread for more than 12 months). - PAHO, "Measles elimination status in the United States and Mexico", 16 January 2026, (meeting set for 13 April 2026; outbreaks from 20 January 2025 in the US and 1 February 2025 in Mexico; endemic transmission defined as "a chain of measles virus transmission of the same genotype and lineage that continues uninterrupted for 12 months or more"). - PAHO, "Update on the review of measles elimination status", 2 March 2026, (review moved to November 2026, within the Commission's regular schedule; cites US analysis including complete viral genome sequencing). - PAHO, "Measles and Rubella Elimination Regional Monitoring and Re-Verification Commission to hold sixth annual meeting in November", 14 October 2026, (10–13 November 2026; data for 2025 and the first half of 2026; conclusions go to the PAHO Director). - PAHO, "PAHO calls for regional action as the Americas lose measles elimination status", 10 November 2025, (endemic transmission re-established in Canada; status regained by showing interruption for at least 12 months).