Report for www.cdc.gov

Overall9.0

The overall score for this website.

Accessibility7.8

How accessible the website is to mobile and disabled users.

The following tests contribute to this score:

Experience8.2

How satisfying the website is likely to be for users.

Marketing9.8

How well marketed and popular the website is.

Technology8.7

How well designed and built the website is.

Screenshot of www.cdc.gov

Nibbler tested a sample of 5 pages from this website at 9:59 AM on May 3, 2021 (BST).

Want branded website audits to share with your clients? Learn More

Top priorities for website improvement

  • Check how the website looks using a mobile and a tablet. Consider adding mobile-only styling using media queries. Some websites employ other techniques for mobile visitors which we cannot currently detect. (read more)
  • Ensure that headings are defined in a semantically correct way, i.e. always start with a H1 tag. This is used to summarise the page content. Further tags (H2, H3, H4 etc) are meant to summarise and partition sections within the content. (read more)
  • Consider the amount of text on this website and increase it if appropriate. (read more)

Mobile3.0

Mobile screenshot of www.cdc.govTablet screenshot of www.cdc.gov
  • None of this website appears to be optimized for viewing on a mobile or tablet (using CSS media queries). It is important to make sure your content is optimized for a wide range of devices as a growing percentage of web browsing is done on phones and tablets.

Headings8.0

actividades adhd attention-deficit cancer diabetes disclaimer disorder elegir estr exit hyperactivity johnson learn notification policy programs reduzca related seguras vacuna

  • All pages were found to use defined headings. This is excellent as it allows visitors and search engines to summarize the content of webpages quickly. Correctly defined headings aid accessibility and are particularly important for search engine optimization.
  • Some pages did not define headings correctly. The H1 tag should be used for the most top-level heading, with H2 being used for sub-headings and H3 for further sub-headings and so-on. Not conforming to this convention may confuse visitors.
    • Ensure that headings are defined in a semantically correct way, i.e. always start with a H1 tag. This is used to summarise the page content. Further tags (H2, H3, H4 etc) are meant to summarise and partition sections within the content.

Page headings detail

URLHeadingLevel
www.cdc.gov/Exit Notification/Disclaimer PolicyH4
www.cdc.gov/spanish/Elegir actividades más segurasH4
www.cdc.gov/spanish/Reduzca su estrésH4
www.cdc.gov/spanish/La vacuna de Johnson & JohnsonH4
www.cdc.gov/spanish/Exit Notification/Disclaimer PolicyH4
www.cdc.gov/ncbddd/adhd/Learn About Attention-Deficit / Hyperactivity Disorder (ADHD)H1
www.cdc.gov/ncbddd/adhd/Exit Notification/Disclaimer PolicyH4
www.cdc.gov/cancer/CancerH1
www.cdc.gov/cancer/Exit Notification/Disclaimer PolicyH4
www.cdc.gov/diabetes/index.htmlDiabetesH1
www.cdc.gov/diabetes/index.htmlRelated ProgramsH2
www.cdc.gov/diabetes/index.htmlExit Notification/Disclaimer PolicyH4

URL format8.8

  • 1 URLs include a file extension.
    • Avoid use of file extensions wherever possible. File extensions appear at the end of web addresses, and have several negative effects. They make the address harder to remember or type (particularly for non-technical users), and can reveal the underlying technology of the website making it very slightly more vulnerable to hackers. They also tie the implementation of the website to a specific technology, which can make subsequent migration of URLs difficult. Consider URL rewriting as an effective and transparent means of creating appropriate URLs.

      Page extensions

Amount of content8.8

Rendering Chart...

  • This website has an average of 548 words per page. The amount of content on a website has been shown to correlate with its search engine ranking.
    • Consider the amount of text on this website and increase it if appropriate.

Amount of content discovered

Twitter10.0

This website is linked with the Twitter account @CDCgov

This website's Twitter account has
3,881,178 followers

  • This website was found to link the Twitter account CDC (@CDCgov).
  • This website's Twitter account has made 30,184 tweets to 3,881,178 followers.

Source: Twitter

Server behavior10.0

Yes404 page

YesCompression

  • This website handles missing pages correctly by sending a 404 HTTP status code.
  • This website was served with GZIP encoding. This is very good because it reduces the loading time of a web page.
  • 3 of the pages of this website follow the best practice of using a permanent (HTTP 301) redirect between URLs with/without trailing slashes. These pages are ideal.
  • One page of this website returns page content with or without a trailing slash on its URL, but it uses a canonical tag to denote the correct versions. This is ideal, as search engines will know which version to index.
  • This website follows the best practice of using a permanent (HTTP 301) redirect from http://cdc.gov to http://www.cdc.gov. This is ideal.

Analytics10.0

100% of pages use analytics

Multiple Analytics Solutions

  • Every page in this website is using some form of analytics software. This is excellent and should allow for a complete analysis of visitor behavior.

Analytics Software Found

Software Name
Google Analytics
SiteCatalyst

Page titles10.0

100% of pages have defined titles

0% of page titles are weak

  • All pages were found to use page titles appropriately. Page titles appear in search results and at the top of the browser's window when visiting the site. Appropriate page titles are particularly important for search engine optimization.

Page titles

Page titleNotes
No TitleMissing
No TitleMissing
No TitleMissing
No TitleMissing
No TitleMissing

Images10.0

0% of images have a clearly defined size

No images are being resized by the browser

Meta tags10.0

This is how this website will look in Google search listings:

stats

www.cdc.gov/

As the nation’s health protection agency, CDC saves lives and protects people from health, safety, and security threats.

  • All pages were found to include a meta description. This is good because search engines (like Google) show this text in search result pages.

Meta Tags (name attribute)

Page URLNameContent
www.cdc.gov/viewportwidth=device-width, initial-scale=1, shrink-to-fit=no
www.cdc.gov/mobile-web-app-capableyes
www.cdc.gov/apple-mobile-web-app-capableyes
www.cdc.gov/descriptionAs the nation’s health protection agency, CDC saves lives and protects people from health, safety, and security threats.
www.cdc.gov/keywordsCDC, 24/7, protect America, health, safety, security threats, foreign, U.S. diseases, chronic, acute, curable, preventable, human error, deliberate attack, supports communities, CDC Organization
www.cdc.gov/twitter:cardsummary_large_image
www.cdc.gov/twitter:site@CDCgov
www.cdc.gov/twitter:creator@CDCgov
www.cdc.gov/twitter:titleCDC Works 24/7
www.cdc.gov/twitter:descriptionAs the nation's health protection agency, CDC saves lives and protects people from health, safety, and security threats.
www.cdc.gov/twitter:image:srchttps://www.cdc.gov/homepage/images/centers-for-disease-control-and-prevention.png
www.cdc.gov/robotsindex, archive
www.cdc.gov/dc.date2021-04-29T01:10:41Z
www.cdc.gov/cdc:last_published2021-04-29T13:43:52Z
www.cdc.gov/spanish/viewportwidth=device-width, initial-scale=1, shrink-to-fit=no
www.cdc.gov/spanish/mobile-web-app-capableyes
www.cdc.gov/spanish/apple-mobile-web-app-capableyes
www.cdc.gov/spanish/descriptionPágina principal de los Centros para el Control y la Prevención de Enfermedades CDC
www.cdc.gov/spanish/keywordsCDC, Centros para el Control y la Prevención de Enfermedades CDC, Enfermedades y afecciones, salud, Vida saludable, Datos y estadísticas, Publicaciones, Etapas de la vida, Acerca de los CDC, Health Communication
www.cdc.gov/spanish/twitter:cardsummary_large_image
www.cdc.gov/spanish/twitter:site@CDCgov
www.cdc.gov/spanish/twitter:creator@CDCgov
www.cdc.gov/spanish/twitter:titleCDC Works 24/7
www.cdc.gov/spanish/twitter:descriptionAs the nation's health protection agency, CDC saves lives and protects people from health, safety, and security threats.
www.cdc.gov/spanish/twitter:image:srchttps://www.cdc.gov/homepage/images/centers-for-disease-control-and-prevention.png
www.cdc.gov/spanish/robotsindex, archive
www.cdc.gov/spanish/dc.date2021-04-29T12:48:22Z
www.cdc.gov/spanish/cdc:last_published2021-04-29T13:56:45Z
www.cdc.gov/ncbddd/adhd/viewportwidth=device-width, initial-scale=1, shrink-to-fit=no
www.cdc.gov/ncbddd/adhd/mobile-web-app-capableyes
www.cdc.gov/ncbddd/adhd/apple-mobile-web-app-capableyes
www.cdc.gov/ncbddd/adhd/descriptionADHD is one of the most common neurobehavioral disorders of childhood. It is usually first diagnosed in childhood and often lasts into adulthood. Children with ADHD have trouble paying attention, controlling impulsive behaviors (may act without thinking about what the result will be), and in some cases, are overly active.
www.cdc.gov/ncbddd/adhd/keywordsCDC, ADHD medication, ADHD symptoms, ADHD in children, ADHD test, ADHD in Adults, ADHD diet, ADHD symptoms in children, ADHD treatment, ADHD symptoms in Adults, Attention Deficit/Hyperactivity Disorder (ADHD)
www.cdc.gov/ncbddd/adhd/twitter:cardsummary_large_image
www.cdc.gov/ncbddd/adhd/twitter:site@CDCgov
www.cdc.gov/ncbddd/adhd/twitter:creator@CDCgov
www.cdc.gov/ncbddd/adhd/twitter:titleAttention-Deficit / Hyperactivity Disorder (ADHD)
www.cdc.gov/ncbddd/adhd/twitter:descriptionPeople with ADHD may have trouble paying attention, controlling impulsive behaviors, or be overly active.
www.cdc.gov/ncbddd/adhd/twitter:image:srchttps://www.cdc.gov/ncbddd/adhd/sm/sm-doctor-consultation-600x300.jpg
www.cdc.gov/ncbddd/adhd/robotsindex, archive
www.cdc.gov/ncbddd/adhd/dc.date2021-01-26T01:52:34Z
www.cdc.gov/ncbddd/adhd/cdc:last_published2021-01-28T19:16:37Z
www.cdc.gov/cancer/viewportwidth=device-width, initial-scale=1, shrink-to-fit=no
www.cdc.gov/cancer/mobile-web-app-capableyes
www.cdc.gov/cancer/apple-mobile-web-app-capableyes
www.cdc.gov/cancer/descriptionAdvancing cancer prevention nationwide for everyone.
www.cdc.gov/cancer/keywordscancer, CDC, prevention, control, data, statistics, facts, colorectal, colon, breast, lung, gynecologic, prostate, skin, cervical, ovarian, uterine, vaginal, vulvar, liver, surveillance, software, research, articles, science, HPV, early detection, screening, tests, resources, men's health, women's health, comprehensive cancer control, programs, campaigns, education, public health, BRCA, mammogram, pap test, colonoscopy, FOBT, incidence, mortality, risk factors, continuing education, ce, symptoms, treatment, Cancer
www.cdc.gov/cancer/twitter:cardsummary
www.cdc.gov/cancer/twitter:site@CDC_Cancer
www.cdc.gov/cancer/twitter:creator@CDCgov
www.cdc.gov/cancer/twitter:titleCancer Prevention and Control
www.cdc.gov/cancer/twitter:descriptionCDC is a leader in nationwide efforts to develop, put into action, and promote effective strategies for preventing and controlling cancer.
www.cdc.gov/cancer/twitter:image:srchttps://www.cdc.gov/cancer/images/dcpc-480x480.jpg
www.cdc.gov/cancer/robotsindex, archive
www.cdc.gov/cancer/dc.date2021-04-21T09:50:06Z
www.cdc.gov/cancer/cdc:last_published2021-04-22T17:06:58Z
www.cdc.gov/diabetes/index.htmlviewportwidth=device-width, initial-scale=1, shrink-to-fit=no
www.cdc.gov/diabetes/index.htmlmobile-web-app-capableyes
www.cdc.gov/diabetes/index.htmlapple-mobile-web-app-capableyes
www.cdc.gov/diabetes/index.htmldescriptionThe DDT home site features information on CDC's efforts on diabetes prevention and control.
www.cdc.gov/diabetes/index.htmlkeywordsDDT, Division of Diabetes Translation, CDC, diabetes, prevent, prevention, education, Basics, Data and Statistics, Managing Diabetes, Research, Type 2, Press and social media, resources and publications, state and local programs, diabetes information, how to deal with diabetes, Diabetes
www.cdc.gov/diabetes/index.htmlrobotsindex, archive
www.cdc.gov/diabetes/index.htmlgoogle-site-verification-st1Zrujt0AHsaglNYchRJbJeuAl3nqsmIW3KApHuaQ
www.cdc.gov/diabetes/index.htmldc.date2021-03-30T05:48:03Z
www.cdc.gov/diabetes/index.htmlcdc:last_published2021-03-31T15:20:25Z

Meta Tags (http-equiv attribute)

Page URLNameContent
www.cdc.gov/X-UA-CompatibleIE=Edge
www.cdc.gov/spanish/X-UA-CompatibleIE=Edge
www.cdc.gov/ncbddd/adhd/X-UA-CompatibleIE=Edge
www.cdc.gov/cancer/X-UA-CompatibleIE=Edge
www.cdc.gov/diabetes/index.htmlX-UA-CompatibleIE=Edge

Printability10.0

100% of pages are optimized for printing

  • All pages of this website appear to be optimized for printing (using CSS).

Media specific CSS detected

MediaMin widthMax widthCSS file
print--www.cdc.gov/.../print.min.css

Popularity10.0

439 Most popular website in the world

This website recently saw a moderate increase in popularity.

  • This is the 439 most popular website in the world.
  • Over the past 3 months, this website has experienced a moderate increase in popularity.
  • This website accounts for 77.5% of the Internet traffic to cdc.gov and its subdomains.

Source: Alexa

Freshness10.0

Last updated April 29, 2021

  • It looks like this website was last updated on Thursday, April 29, 2021. This is good because visitors perceive up-to-date websites as more credible. Websites that are updated regularly are also spidered by search engines more often.
  • To find this information we used the last modified dates reported by this website's server in addition to looking for dates written on each page.

All dates found

DateFileSource
2/19/21www.cdc.gov/spanish/Body text
1/26/21www.cdc.gov/ncbddd/adhd/Body text
4/21/21www.cdc.gov/cancer/Body text
3/30/21www.cdc.gov/diabetes/index.htmlBody text
5/31/19www.cdc.gov/.../DDT_Index_VHI.pngLast modified header
5/31/19www.cdc.gov/.../DDT_Index_CKD.pngLast modified header
5/31/19www.cdc.gov/.../DDT_Index_Native.pngLast modified header
12/14/20www.cdc.gov/.../state-local-national-partnerships-map.jpgLast modified header
12/14/20www.cdc.gov/.../20_321192-A_Leonard_National_Diabetes_PP_infographic_08.pngLast modified header
5/31/19www.cdc.gov/.../DDT_Index_Data.pngLast modified header
5/31/19www.cdc.gov/.../DDT_Index_LivingWith.pngLast modified header
5/31/19www.cdc.gov/.../DDT_Index_prevention.jpgLast modified header
5/31/19www.cdc.gov/.../DDT_Index_Basics.pngLast modified header
5/31/19www.cdc.gov/.../DDT_Index_RiskTest.pngLast modified header
3/31/21www.cdc.gov/.../GettyImages-1197692604.jpgLast modified header
12/21/20www.cdc.gov/.../usmap-tablet-684.jpgLast modified header
12/21/20www.cdc.gov/.../survivor-flowers-684.jpgLast modified header
12/21/20www.cdc.gov/.../doctor-couple-684.jpgLast modified header
4/1/21www.cdc.gov/.../man-doctor-899-sq.jpgLast modified header
2/11/19www.cdc.gov/.../focus-for-the-future400x200.jpgLast modified header
5/14/19www.cdc.gov/ncbddd/.../us-map.pngLast modified header
10/5/20www.cdc.gov/.../teen-studying-at-home-on-computer-900px.jpgLast modified header
7/18/18www.cdc.gov/.../about-sp-600px.jpgLast modified header
2/7/19www.cdc.gov/.../about-cdc-400px.jpgLast modified header
4/14/21www.cdc.gov/.../jj-vaccine_650x380px.jpgLast modified header
4/29/21www.cdc.gov/.../reduce-your-stress_650x380px.jpgLast modified header
4/29/21www.cdc.gov/.../choosing-safer-activities_650x380px.jpgLast modified header
1/7/19www.cdc.gov/.../outbreaks-secondary.pngLast modified header
9/9/20www.cdc.gov/.../covid-19-banner2-650px.jpgLast modified header
5/23/20www.cdc.gov/homepage/.../pcd.pngLast modified header
5/23/20www.cdc.gov/homepage/.../eid.pngLast modified header
5/23/20www.cdc.gov/homepage/.../mmwr.pngLast modified header
5/23/20www.cdc.gov/homepage/.../about-cdc.jpgLast modified header
1/4/21www.cdc.gov/.../312176_IamCdcRamsey-720x405px.jpgLast modified header
2/24/21www.cdc.gov/.../fellowships-labs-720px.jpgLast modified header
1/27/21www.cdc.gov/.../sanchez-ppe-647x381px.jpgLast modified header
5/23/20www.cdc.gov/.../outbreaks-secondary.pngLast modified header
4/13/21www.cdc.gov/.../JJ-Vaccine-720x400-1.jpgLast modified header
4/12/21www.cdc.gov/.../lab-tech-720x400-1.jpgLast modified header
4/29/21www.cdc.gov/.../man-backpack-smiling-720x400-1.jpgLast modified header
4/27/21www.cdc.gov/.../safer-activities-720x400px.jpgLast modified header
10/8/20www.cdc.gov/.../covid-19-home-page-banner-1330x370px.jpgLast modified header
4/29/21www.cdc.gov/.../print.min.cssLast modified header
1/29/19www.cdc.gov/ncbddd/.../localrd.cssLast modified header

Domain agei

  • Sorry, we cannot check the domain age of .gov websites.

Fast, branded website audits

Silktide Prospect creates professional website reports that can be shared with your clients.

How does Silktide Prospect compare?

Tests 17 fixed tests 50+ testsCovers SEO, SEM, Google My Business, reviews, social media and much more
Add your brandingNoYes
Export & shareNoPDF & link
Lead generationNoEmbed on your site
Competitor auditsNoYes
Test as a batchNoYes
Integrations + APINoYes
Multi-lingualNo20+ languages
Try it free