Social Vulnerability Index Recalculation

The Social Vulnerability Index Recalculation is based on the important work of the federal Centers for Disease Control. With the future of that index in doubt, the same federal datasets and methodologies were used to carry the index forward.

The most recent SVI uses the 2022 American Communities Survey as its base. This recalculation matches the 2022 baseline 100 percent. The 2022 methodologies form the basis of the updated calculations for subsequent ACS vintages. This platform will run updates on all new ACS releases.

Should the SVI be updated with changed methodologies, this platform will update to match, while preserving the 2022 methodologies for comparison purposes.

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NationallyWithin its state

Butler County — Social Vulnerability Index

Unofficial CDC-method recomputation, 2020–2024 ACS 5-year
Butler County — Social Vulnerability Index by census tract
Tract 1.00 — 52 (Upper-middle)Tract 2.00 — 69 (Upper-middle)Tract 3.00 — 89 (Higher)Tract 4.00 — 71 (Higher)Tract 5.00 — 92 (Higher)Tract 6.00 — 80 (Higher)Tract 10.01 — 67 (Upper-middle)Tract 10.02 — 60 (Upper-middle)Tract 11.00 — 67 (Upper-middle)Tract 13.00 — 35 (Middle)Tract 101.02 — 69 (Higher)Tract 101.03 — 30 (Middle)Tract 101.04 — 30 (Middle)Tract 101.05 — 34 (Middle)Tract 101.06 — 60 (Upper-middle)Tract 102.01 — 0 (Lower)Tract 102.02 — 45 (Middle)Tract 102.03 — 10 (Lower-middle)Tract 103.01 — 13 (Lower-middle)Tract 103.02 — 23 (Lower-middle)Tract 105.00 — 66 (Upper-middle)Tract 106.00 — 22 (Lower-middle)Tract 108.00 — 10 (Lower)Tract 109.01 — 60 (Upper-middle)Tract 109.03 — 59 (Upper-middle)Tract 109.04 — 47 (Upper-middle)Tract 109.06 — 82 (Higher)Tract 109.07 — 40 (Middle)Tract 109.09 — 80 (Higher)Tract 109.10 — 19 (Lower-middle)Tract 109.11 — 32 (Middle)Tract 109.12 — 16 (Lower-middle)Tract 109.13 — 43 (Middle)Tract 110.03 — 33 (Middle)Tract 110.04 — 82 (Higher)Tract 110.05 — 3 (Lower)Tract 110.06 — 8 (Lower)Tract 111.09 — 31 (Middle)Tract 111.10 — 8 (Lower)Tract 111.11 — 39 (Middle)Tract 111.12 — 4 (Lower)Tract 111.18 — 31 (Middle)Tract 111.20 — 7 (Lower)Tract 111.22 — 38 (Middle)Tract 111.23 — 81 (Higher)Tract 111.25 — 24 (Lower-middle)Tract 111.26 — 54 (Upper-middle)Tract 111.27 — 20 (Lower-middle)Tract 111.28 — 3 (Lower)Tract 111.29 — 3 (Lower)Tract 111.30 — 46 (Middle)Tract 111.31 — 3 (Lower)Tract 111.32 — 17 (Lower-middle)Tract 111.33 — 10 (Lower-middle)Tract 111.34 — 2 (Lower)Tract 111.35 — 11 (Lower-middle)Tract 111.36 — 2 (Lower)Tract 111.37 — 0 (Lower)Tract 112.00 — 22 (Lower-middle)Tract 113.00 — 66 (Upper-middle)Tract 118.00 — 7 (Lower)Tract 121.00 — 10 (Lower)Tract 122.00 — 57 (Upper-middle)Tract 123.00 — 69 (Upper-middle)Tract 124.00 — 9 (Lower)Tract 125.00 — 5 (Lower)Tract 126.00 — 16 (Lower-middle)Tract 127.00 — 34 (Middle)Tract 130.00 — 82 (Higher)Tract 131.00 — 73 (Higher)Tract 132.00 — 66 (Upper-middle)Tract 133.00 — 39 (Middle)Tract 134.00 — 74 (Higher)Tract 135.00 — 81 (Higher)Tract 136.00 — 90 (Higher)Tract 139.00 — 46 (Upper-middle)Tract 140.00 — 92 (Higher)Tract 141.00 — 82 (Higher)Tract 143.00 — 11 (Lower-middle)Tract 144.00 — 96 (Higher)Tract 146.00 — 94 (Higher)Tract 147.00 — 32 (Middle)Tract 148.00 — 56 (Upper-middle)Tract 149.00 — 15 (Lower-middle)Tract 150.00 — 29 (Lower-middle)Tract 151.00 — 22 (Lower-middle)
Where this is
Shading: Overall SVI Percentile
Lower (0 to 10)Lower-middle (10 to 29)Middle (30 to 46)Upper-middle (46 to 69)Higher (69 to 96)
Each unit is shaded by its Overall SVI Percentile value and grouped into equal-count bands (quantiles) against the other units shown — lighter = lower, darker = higher. It ranks position among the units in view; it does not grade places, and the ranges shift with which units are shown.
The map is bounded to this parent geography — it shows the selected unit among its own siblings only, the same depth rule the drill-down uses. Shading ranks position on the measure among the units shown; it does not grade places.

Click a tract to see its overall percentile and theme scores.

Median tract: 35th percentile (among all U.S. tracts).
These tracts span the 0th percentile to the 96th percentile. The width of that range is the internal disparity.
Well above the median14 (16%) · 55,717 people
Above the median13 (15%) · 48,033 people
Near the median11 (13%) · 52,499 people
Below the median20 (23%) · 96,805 people
Well below the median28 (33%) · 139,822 people
Widest spread across these tracts: Household Characteristics — this theme most separates the higher- and lower-ranked tracts here.
The SVI ranks each tract's position relative to a comparison set; it is not averaged into one number for the area, because percentiles do not average meaningfully. The distribution — median, range, and shape below — is the summary.
Well above the median — 14 tracts (80th–100th percentile)
Tract 144.00 (pop. 2,722) — 96th percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (well above), Household Characteristics (well above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above).
Tract 146.00 (pop. 1,281) — 94th percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (well above) and Housing Type & Transportation (well above); near the median on Racial & Ethnic Minority Status; below the median on Household Characteristics.
Tract 5.00 (pop. 4,948) — 92nd percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (well above), Household Characteristics (well above) and Housing Type & Transportation (above); near the median on Racial & Ethnic Minority Status.
Tract 140.00 (pop. 2,080) — 92nd percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (above), Household Characteristics (well above) and Housing Type & Transportation (well above); near the median on Racial & Ethnic Minority Status.
Tract 136.00 (pop. 4,905) — 90th percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (well above), Household Characteristics (well above) and Housing Type & Transportation (above); near the median on Racial & Ethnic Minority Status.
Tract 3.00 (pop. 3,618) — 89th percentile — Well above the median
Driven by Socioeconomic Status (well above), Household Characteristics (well above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above).
Tract 141.00 (pop. 2,233) — 82nd percentile — Well above the median
Driven by Socioeconomic Status (well above), Household Characteristics (well above) and Housing Type & Transportation (above); near the median on Racial & Ethnic Minority Status.
Tract 109.06 (pop. 7,853) — 82nd percentile — Well above the median
Driven by Socioeconomic Status (above), Household Characteristics (above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above).
Tract 130.00 (pop. 1,697) — 82nd percentile — Well above the median
Driven by Socioeconomic Status (well above), Household Characteristics (well above) and Racial & Ethnic Minority Status (above); below the median on Housing Type & Transportation.
Tract 110.04 (pop. 6,790) — 82nd percentile — Well above the median
Driven by Household Characteristics (well above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above); near the median on Socioeconomic Status.
Tract 135.00 (pop. 2,961) — 81st percentile — Well above the median
Driven by Socioeconomic Status (well above) and Housing Type & Transportation (above); near the median on Racial & Ethnic Minority Status; below the median on Household Characteristics.
Tract 111.23 (pop. 4,980) — 81st percentile — Well above the median
Driven by Socioeconomic Status (above), Household Characteristics (well above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (above).
Tract 6.00 (pop. 4,479) — 80th percentile — Well above the median
Driven by Socioeconomic Status (well above) and Housing Type & Transportation (above); near the median on Household Characteristics; below the median on Racial & Ethnic Minority Status.
Tract 109.09 (pop. 5,170) — 80th percentile — Well above the median
Driven by Socioeconomic Status (above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above); below the median on Household Characteristics.
Above the median — 13 tracts (60th–80th percentile)
Tract 134.00 (pop. 2,345) — 74th percentile — Above the median
Driven by Socioeconomic Status (well above) and Household Characteristics (above); near the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 131.00 (pop. 2,421) — 73rd percentile — Above the median
Driven by Socioeconomic Status (well above), Household Characteristics (well above) and Racial & Ethnic Minority Status (above); below the median on Housing Type & Transportation.
Tract 4.00 (pop. 3,867) — 71st percentile — Above the median
Driven by Socioeconomic Status (well above) and Household Characteristics (above); near the median on Racial & Ethnic Minority Status; below the median on Housing Type & Transportation.
Tract 101.02 (pop. 2,850) — 69th percentile — Above the median
Driven by Socioeconomic Status (above), Household Characteristics (above) and Housing Type & Transportation (well above); below the median on Racial & Ethnic Minority Status.
Tract 2.00 (pop. 3,954) — 69th percentile — Above the median
Driven by Socioeconomic Status (above) and Household Characteristics (well above); near the median on Racial & Ethnic Minority Status; below the median on Housing Type & Transportation.
Tract 123.00 (pop. 2,143) — 69th percentile — Above the median
Driven by Socioeconomic Status (well above) and Household Characteristics (well above); below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 11.00 (pop. 4,402) — 67th percentile — Above the median
Driven by Socioeconomic Status (well above) and Household Characteristics (well above); below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 10.01 (pop. 5,462) — 67th percentile — Above the median
Driven by Socioeconomic Status (above), Household Characteristics (well above) and Housing Type & Transportation (above); below the median on Racial & Ethnic Minority Status.
Tract 113.00 (pop. 7,353) — 66th percentile — Above the median
Driven by Household Characteristics (above) and Housing Type & Transportation (well above); near the median on Socioeconomic Status; below the median on Racial & Ethnic Minority Status.
Tract 105.00 (pop. 2,333) — 66th percentile — Above the median
Driven by Socioeconomic Status (well above); near the median on Household Characteristics; below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 132.00 (pop. 3,458) — 66th percentile — Above the median
Driven by Socioeconomic Status (well above), Household Characteristics (well above) and Racial & Ethnic Minority Status (above); below the median on Housing Type & Transportation.
Tract 109.01 (pop. 4,567) — 60th percentile — Above the median
Driven by Housing Type & Transportation (well above); near the median on Household Characteristics and Racial & Ethnic Minority Status; below the median on Socioeconomic Status.
Tract 101.06 (pop. 2,878) — 60th percentile — Above the median
Driven by Socioeconomic Status (well above) and Housing Type & Transportation (well above); below the median on Household Characteristics and Racial & Ethnic Minority Status.
Near the median — 11 tracts (40th–60th percentile)
Tract 10.02 (pop. 5,125) — 60th percentile — Near the median
Driven by Household Characteristics (above) and Housing Type & Transportation (above); near the median on Socioeconomic Status; below the median on Racial & Ethnic Minority Status.
Tract 109.03 (pop. 6,061) — 59th percentile — Near the median
Driven by Socioeconomic Status (above) and Household Characteristics (well above); near the median on Racial & Ethnic Minority Status; below the median on Housing Type & Transportation.
Tract 122.00 (pop. 2,758) — 57th percentile — Near the median
Driven by Socioeconomic Status (above) and Household Characteristics (above); near the median on Housing Type & Transportation; below the median on Racial & Ethnic Minority Status.
Tract 148.00 (pop. 7,671) — 56th percentile — Near the median
Driven by Socioeconomic Status (above) and Household Characteristics (above); near the median on Racial & Ethnic Minority Status; below the median on Housing Type & Transportation.
Tract 111.26 (pop. 6,460) — 54th percentile — Near the median
Driven by Socioeconomic Status (above); near the median on Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 1.00 (pop. 4,711) — 52nd percentile — Near the median
Driven by Socioeconomic Status (above) and Household Characteristics (above); below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 109.04 (pop. 3,722) — 47th percentile — Near the median
Near the median on Household Characteristics and Housing Type & Transportation; below the median on Socioeconomic Status and Racial & Ethnic Minority Status.
Tract 139.00 (pop. 2,494) — 46th percentile — Near the median
Driven by Socioeconomic Status (above) and Household Characteristics (above); below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.30 (pop. 5,267) — 46th percentile — Near the median
Driven by Household Characteristics (above) and Housing Type & Transportation (above); near the median on Racial & Ethnic Minority Status; below the median on Socioeconomic Status.
Tract 102.02 (pop. 4,994) — 45th percentile — Near the median
Driven by Housing Type & Transportation (above); near the median on Household Characteristics; below the median on Socioeconomic Status and Racial & Ethnic Minority Status.
Tract 109.13 (pop. 3,236) — 43rd percentile — Near the median
Driven by Racial & Ethnic Minority Status (above); near the median on Socioeconomic Status; below the median on Household Characteristics and Housing Type & Transportation.
Below the median — 20 tracts (20th–40th percentile)
Tract 109.07 (pop. 2,817) — 40th percentile — Below the median
Near the median on Socioeconomic Status and Household Characteristics; below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 133.00 (pop. 2,798) — 39th percentile — Below the median
Driven by Household Characteristics (above); near the median on Socioeconomic Status; below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.11 (pop. 6,260) — 39th percentile — Below the median
Driven by Housing Type & Transportation (above); below the median on Socioeconomic Status, Household Characteristics and Racial & Ethnic Minority Status.
Tract 111.22 (pop. 5,950) — 38th percentile — Below the median
Driven by Socioeconomic Status (above) and Racial & Ethnic Minority Status (above); below the median on Household Characteristics and Housing Type & Transportation.
Tract 13.00 (pop. 4,368) — 35th percentile — Below the median
Near the median on Socioeconomic Status and Household Characteristics; below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 127.00 (pop. 3,069) — 34th percentile — Below the median
Near the median on Socioeconomic Status and Household Characteristics; below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 101.05 (pop. 4,349) — 34th percentile — Below the median
Driven by Socioeconomic Status (above) and Housing Type & Transportation (above); near the median on Racial & Ethnic Minority Status; below the median on Household Characteristics.
Tract 110.03 (pop. 7,325) — 33rd percentile — Below the median
Near the median on Socioeconomic Status and Household Characteristics; below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 147.00 (pop. 4,056) — 32nd percentile — Below the median
Near the median on Socioeconomic Status; below the median on Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 109.11 (pop. 3,882) — 32nd percentile — Below the median
Near the median on Socioeconomic Status, Household Characteristics and Racial & Ethnic Minority Status; below the median on Housing Type & Transportation.
Tract 111.09 (pop. 4,149) — 31st percentile — Below the median
Near the median on Socioeconomic Status and Household Characteristics; below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.18 (pop. 3,474) — 31st percentile — Below the median
Near the median on Housing Type & Transportation; below the median on Socioeconomic Status, Household Characteristics and Racial & Ethnic Minority Status.
Tract 101.03 (pop. 5,333) — 30th percentile — Below the median
Near the median on Socioeconomic Status; below the median on Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 101.04 (pop. 4,616) — 30th percentile — Below the median
Driven by Socioeconomic Status (above); below the median on Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 150.00 (pop. 7,293) — 29th percentile — Below the median
Near the median on Household Characteristics; below the median on Socioeconomic Status, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.25 (pop. 3,790) — 24th percentile — Below the median
Near the median on Household Characteristics and Racial & Ethnic Minority Status; below the median on Socioeconomic Status and Housing Type & Transportation.
Tract 103.02 (pop. 3,562) — 23rd percentile — Below the median
Near the median on Socioeconomic Status and Household Characteristics; below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 151.00 (pop. 7,431) — 22nd percentile — Below the median
Driven by Household Characteristics (above); near the median on Socioeconomic Status; below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 106.00 (pop. 3,355) — 22nd percentile — Below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 112.00 (pop. 8,928) — 22nd percentile — Below the median
Near the median on Household Characteristics; below the median on Socioeconomic Status, Racial & Ethnic Minority Status and Housing Type & Transportation.
Well below the median — 28 tracts (0th–20th percentile)
Tract 111.27 (pop. 4,731) — 20th percentile — Well below the median
Near the median on Household Characteristics and Racial & Ethnic Minority Status; below the median on Socioeconomic Status and Housing Type & Transportation.
Tract 109.10 (pop. 4,404) — 19th percentile — Well below the median
Near the median on Household Characteristics; below the median on Socioeconomic Status, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.32 (pop. 4,630) — 17th percentile — Well below the median
Driven by Household Characteristics (above); below the median on Socioeconomic Status, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 109.12 (pop. 2,680) — 16th percentile — Well below the median
Near the median on Racial & Ethnic Minority Status; below the median on Socioeconomic Status, Household Characteristics and Housing Type & Transportation.
Tract 126.00 (pop. 2,310) — 16th percentile — Well below the median
Near the median on Socioeconomic Status; below the median on Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 149.00 (pop. 5,707) — 15th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 103.01 (pop. 4,441) — 13th percentile — Well below the median
Near the median on Household Characteristics; below the median on Socioeconomic Status, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 143.00 (pop. 5,092) — 11th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.35 (pop. 8,056) — 11th percentile — Well below the median
Near the median on Racial & Ethnic Minority Status; below the median on Socioeconomic Status, Household Characteristics and Housing Type & Transportation.
Tract 111.33 (pop. 4,385) — 10th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 102.03 (pop. 5,413) — 10th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 108.00 (pop. 6,503) — 10th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 121.00 (pop. 3,076) — 10th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 124.00 (pop. 2,662) — 9th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.10 (pop. 6,000) — 8th percentile — Well below the median
Driven by Household Characteristics (above); below the median on Socioeconomic Status, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 110.06 (pop. 5,650) — 8th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 118.00 (pop. 7,031) — 7th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.20 (pop. 7,557) — 7th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 125.00 (pop. 5,497) — 5th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.12 (pop. 6,398) — 4th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.29 (pop. 5,114) — 3rd percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 110.05 (pop. 7,404) — 3rd percentile — Well below the median
Near the median on Racial & Ethnic Minority Status; below the median on Socioeconomic Status, Household Characteristics and Housing Type & Transportation.
Tract 111.28 (pop. 2,964) — 3rd percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.31 (pop. 3,445) — 3rd percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.36 (pop. 5,424) — 2nd percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.34 (pop. 7,962) — 2nd percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 102.01 (pop. 1,894) — 0th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 111.37 (pop. 3,392) — 0th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
SVI = the CDC/ATSDR Social Vulnerability Index, recomputed by this platform from American Community Survey 2020–2024 5-year estimates using CDC's published method. Percentiles rank each tract against all U.S. tracts. "Vulnerability" is the name of CDC's index; the platform reports where a place ranks on it, and does not grade places or their residents.
Top-decile flags follow CDC's own convention (≥ 90th percentile) and are attributed as such; they are not part of an official CDC distribution.

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