How to Cite CDC in Chicago 17 Format

The Centers for Disease Control and Prevention (CDC) publishes a wide range of materials—from the Morbidity and Mortality Weekly Report (MMWR) to surveillance summaries, data briefs, and web-based fact sheets. Citing CDC sources in Chicago 17th Edition format requires careful attention because the authoring body is often the CDC itself (a corporate author), publication types vary widely, and URLs frequently change as content is reorganized. This guide provides specific templates and examples for the most common CDC source types you'll encounter in research.

When to Use Corporate vs. Individual Author Format

The single most important decision when citing CDC material is whether the source names individual authors. This determines the entire structure of your citation.

• Use the corporate author format when the publication lists "Centers for Disease Control and Prevention" or a specific CDC center (e.g., "National Center for Health Statistics") as the author, with no individual names. This applies to most fact sheets, data briefs, guidelines, and web pages.
• Use the individual author format when named researchers are listed. This is standard for MMWR articles, Preventing Chronic Disease articles, and other peer-reviewed CDC journal content.

If both individual authors and the CDC are listed, cite the individual authors and include the CDC context in the journal or publisher information—do not list both as authors.

Where to Find Citation Information on CDC Sources

CDC's website has been redesigned multiple times, so knowing where to look for bibliographic details saves significant effort:

• Author names: For MMWR articles, check the byline directly below the title. For reports, look at the cover page or the "Suggested Citation" line that many CDC publications include near the beginning or end.
• Publication date: Look for "Release Date," "Published," or "Last Reviewed" at the top or bottom of web pages. For MMWR, use the issue date from the volume/issue heading. Avoid "Page last reviewed" dates for content that has a distinct original publication date.
• Report/series numbers: Found on the cover page or header of PDFs. For the National Vital Statistics Reports, this appears as "Volume X, Number Y."
• Suggested citations: Many CDC reports include a "Suggested Citation" box. Use it as a starting point but reformat to Chicago style—CDC's suggested format is typically not Chicago-compliant.
• URLs: Use the most stable URL available. For MMWR, use the DOI if one is provided. For other reports, prefer URLs from cdc.gov/... rather than link shorteners.
• DOIs: MMWR articles published after 2016 generally have DOIs. Check the article header or the footer of the HTML version. Use the DOI in https://doi.org/... format when available.

Detailed Examples

Example 1: MMWR Article with Named Authors

An MMWR Surveillance Summary with a named author team—the most common peer-reviewed CDC source in academic writing.

Key points: List up to ten authors in the bibliography, then use "et al." In footnotes, use the first author plus "et al." when there are four or more authors. Include the DOI rather than a standard URL when one is available.

Example 2: CDC Report with Corporate Author

A National Center for Health Statistics data brief—no individual authors listed, published as a numbered series.

Key points: When a specific center within CDC is the publishing body, list both the parent agency and the center. Include the series name and number (e.g., "NCHS Data Brief no. 360") after the title. The place of publication for NCHS is Hyattsville, MD, not Atlanta.

Example 3: CDC Web Page or Fact Sheet

A general informational page on the CDC website with no named author and no formal publication format.

Key points: Web pages use quotation marks around the title rather than italics, since they are shorter works within the larger CDC website. Use "last reviewed" or "last updated" with the date shown on the page. If no date is available at all, include an access date: "accessed March 5, 2026." For web pages, no place of publication is needed.

Example 4: CDC Clinical Guidelines or Recommendations

Official CDC guidelines, often published in MMWR Recommendations and Reports.

Key points: MMWR Recommendations and Reports is a distinct series from the weekly MMWR—use the full series title. These often have very broad page ranges. When shortening the title in subsequent footnotes, use a recognizable abbreviation that your readers will understand.

Step-by-Step: Citing a CDC Source in Chicago 17

1. Determine the source type. Is it an MMWR article, a data report, a web page, or a guideline? This determines which template you'll follow.
2. Identify the author. Check for named individual authors first. If none are listed, the author is "Centers for Disease Control and Prevention." If a specific center produced the work (e.g., National Center for Health Statistics, National Center for Immunization and Respiratory Diseases), include the center name after the main CDC name.
3. Record the title exactly. Preserve the CDC's capitalization for proper nouns, but otherwise follow Chicago headline-style capitalization. Italicize titles of standalone reports and books; use quotation marks for articles, web pages, and fact sheets.
4. Note the series information. If the source belongs to a numbered series (NCHS Data Brief, Vital and Health Statistics, MMWR Surveillance Summaries), include the series name and number.
5. Find the date. For MMWR, use the issue publication date. For web pages, use "last reviewed" or "last updated." For reports, use the year printed on the cover or title page.
6. Record the place and publisher. For formal reports, use the place of publication (Atlanta, GA for most CDC publications; Hyattsville, MD for NCHS) and the publishing division. Web pages do not require place or publisher.
7. Copy the URL or DOI. Prefer DOIs for MMWR articles. For other sources, use the full URL from your browser's address bar. Avoid shortened or tracking URLs.
8. Format according to Chicago 17. Arrange all elements following the note-bibliography templates above. Double-check punctuation—Chicago uses specific comma and period placement that differs from other styles.

Common Mistakes When Citing CDC in Chicago Format

1. Using "CDC" Instead of the Full Name

In Chicago style, the first footnote and the bibliography entry must use the full name: "Centers for Disease Control and Prevention." You may abbreviate to "CDC" in shortened footnotes after the first reference, but never in the bibliography. Some writers also incorrectly include "U.S. Department of Health and Human Services" as a parent body—this is unnecessary unless the specific publication lists HHS as the author or publisher.

2. Confusing the Date Types on CDC Web Pages

CDC pages often display multiple dates: "Page last reviewed," "Content source," and sometimes an original publication date. Use the most specific date tied to the content itself. If only "Page last reviewed" is available, use that with the label. Do not use a "Content source" attribution date as the publication date.

3. Treating MMWR Articles Like Web Pages

MMWR articles are peer-reviewed journal articles and should be cited as such—with volume, issue number, page range, and (when available) a DOI. Citing them as generic CDC web pages strips away critical bibliographic information that readers need to locate the source.

4. Omitting Series Numbers for Numbered Reports

CDC publishes many numbered series (NCHS Data Briefs, National Vital Statistics Reports, Surveillance Summaries). The series name and number function like a volume and issue for the report and must be included. Without them, a reader cannot efficiently locate the correct document among dozens of similar publications.

5. Incorrect Publisher Location

Not all CDC publications come from Atlanta. The National Center for Health Statistics publishes from Hyattsville, Maryland. Always check the title page or cover of the specific report for the correct city.

6. Missing Access Dates for Undated Content

Chicago 17 generally does not require access dates for online sources if a publication or revision date is available. However, if a CDC page has no date at all, you must include "accessed [date]" so readers know when the content was verified.

Special Cases

Citing CDC Data or Datasets

When citing raw data from CDC systems like WONDER, WISQARS, or the National Notifiable Diseases Surveillance System, treat the database as the title and CDC as the corporate author:

Include the specific query parameters or dataset description in the title if the database covers multiple topics. Always include an access date, since database content updates continuously.

Citing CDC Content That Has Moved or Been Archived

CDC periodically reorganizes its website, causing URLs to break. If you accessed a page that has since moved, provide the current URL if you can locate it, or note the original URL with your access date. If the content has been archived to the Wayback Machine, you may provide the archived URL as a more stable alternative.

CDC Citations vs. General Government Reports

While CDC sources follow the same foundational rules as other government reports in Chicago 17, several practical differences make CDC citations distinct:

For the complete rules on government reports, see the Chicago 17 government report citation guide. For a broader overview of the style, visit our Chicago 17th Edition guide.

Frequently Asked Questions

Should I cite the CDC or the specific center (e.g., NCHS) as the author?

Include both when the publication clearly originates from a specific center. List "Centers for Disease Control and Prevention" first, followed by the center name—for example, "Centers for Disease Control and Prevention, National Center for Health Statistics." This helps readers understand both the institutional authority and the specific unit responsible for the work. If the publication only identifies "CDC" broadly, omit the sub-center.

How do I cite a CDC source that has both a web version and a PDF?

Cite whichever version you actually consulted. If you read the HTML web page, cite the web URL. If you downloaded and read the PDF, cite the PDF URL. The two versions may have different pagination, so consistency matters. When a DOI is available (common for MMWR), use the DOI regardless of which version you read, since DOIs resolve to the canonical location.

Do I need to include "U.S. Department of Health and Human Services" in my citation?

Generally, no. Chicago 17 does not require listing the full bureaucratic hierarchy of a government agency. "Centers for Disease Control and Prevention" is sufficient and universally recognized. Include HHS only if the specific publication's title page lists it as the publisher or if your instructor or publisher requires it.

How do I handle CDC sources with no date?

First, check thoroughly—look at the page footer, the PDF properties, and the Wayback Machine for the earliest archived version. If you truly cannot find any date, omit the date from the citation and add "accessed [full date]" instead. In a footnote, this appears after the URL: "accessed March 5, 2026." In the bibliography, place it before the URL: "Accessed March 5, 2026. https://www.cdc.gov/..."