Nibbler SEO audit for www.cdc.gov

Overall9.5

The overall score for this website.

Accessibility9.3

How accessible the website is to mobile and disabled users.

The following tests contribute to this score:

Experience9.3

How satisfying the website is likely to be for users.

The following tests contribute to this score:

Marketing9.6

How well marketed, and popular the website is.

The following tests contribute to this score:

Technology9.5

How well designed and built the website is.

The following tests contribute to this score:

Nibbler tested a sample of 5 pages from this website at 12:27 on 22 Mar 2024 (GMT).

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Top priorities for website improvement

  • 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. (read more)
  • Check how the website looks using a mobile and consider adding mobile and tablet styling using media queries. Some websites employ other techniques for mobile visitors which we cannot currently detect. (read more)
  • Consider the amount of text on this website and increase it if appropriate. (read more)

URL format6.4

Help

  • 3 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

Mobile8.6

Help

Mobile screenshot of www.cdc.govTablet screenshot of www.cdc.gov
  • Most pages (80.0%) of this website appear to be optimised for viewing on a mobile phone or tablet (using CSS media queries). It is important to make sure your content is optimised for a wide range of devices as a growing percentage of web browsing is done on phones and tablets.

Media specific CSS detected

MediaMin widthMax widthCSS file
only screen-991pxwww.cdc.gov/
only screen-768pxwww.cdc.gov/
only screen-991pxwww.cdc.gov/spanish/
only screen-991pxwww.cdc.gov/health-topics.html
only screen-991pxwww.cdc.gov/datastatistics/index.html
screen-768pxwww.cdc.gov/datastatistics/index.html

Amount of content8.7

Help

Rendering Chart...

  • This website has an average of 517 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

Internal links9.9

Help

  • One link uses text that is too long. Links should describe what they link to briefly. Linking a long block of text usually indicates an attempt to trick search engines into ranking those keywords highly (a strategy which does not work). Long linked blocks of text are also harder for people to scan.
    • Consider shortening long anchor text.

      Overly long link text

      Link URLLink textPage URL
      www.cdc.gov/.../p0318-Worker-Burnout.html‎‎MAR ‎‎18 CDC’s National Institute for Occupational Safety and Health’s Impact Wellbeing™ Campaign Releases Hospital-Tested Guide to Improve Healthcare Worker Burnoutwww.cdc.gov/
  • One link has no text describing its destination. Links on a page should describe their destination for the benefit of both screen readers and search engine spiders.

Server behaviour10.0

Help

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.
  • One page of this website follows the best practice of using a permanent (HTTP 301) redirect between its URL with/without a trailing slash. This page is ideal.
  • 3 of the pages of this website return page content with or without a trailing slash on their URLs, but they use a canonical tag to denote the correct version. 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

Help

100% of pages use analytics

SiteCatalystSiteCatalyst

  • Every page in this website is using SiteCatalyst. This is excellent and should allow for a complete analysis of visitor behaviour.

Page titles10.0

Help

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 optimisation.

Page titles

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

Headings10.0

Help

centers centros common control current data descargo disclaimer disease drug enfermedades exit gente health illness list lives notificaci notification occupational outbreak overdose para people policy prevenci prevention protecting protegemos questions respiratorio respiratory responsabilidad salida salvamos saving sincitial statistics tica topics vaccines vidas virus

  • All pages were found to use defined headings. This is excellent as it allows visitors and search engines to summarise the content of webpages quickly. Correctly defined headings aid accessibility and are particularly important for search engine optimisation.

Page headings detail

URLHeadingLevel
www.cdc.gov/Centers for Disease Control and PreventionH1
www.cdc.gov/Respiratory IllnessH3
www.cdc.gov/CDC 24/7: Saving Lives, Protecting PeopleH4
www.cdc.gov/Exit Notification / Disclaimer PolicyH4
www.cdc.gov/spanish/Centros para el Control y la Prevención de Enfermedades CDCH1
www.cdc.gov/spanish/Prevención del virus respiratorio sincitial (VRS)H2
www.cdc.gov/spanish/CDC 24/7: Salvamos vidas. Protegemos a la gente.H4
www.cdc.gov/spanish/Política de notificación de salida / descargo de responsabilidadH4
www.cdc.gov/health-topics.htmlHealth TopicsH1
www.cdc.gov/health-topics.htmlExit Notification / Disclaimer PolicyH4
www.cdc.gov/outbreaks/index.htmlCDC Current Outbreak ListH1
www.cdc.gov/outbreaks/index.htmlExit Notification / Disclaimer PolicyH4
www.cdc.gov/datastatistics/index.htmlData & StatisticsH1
www.cdc.gov/datastatistics/index.htmlExit Notification / Disclaimer PolicyH4
www.cdc.gov/datastatistics/index.htmlCommon Questions about VaccinesH5
www.cdc.gov/datastatistics/index.htmlDrug OverdoseH5
www.cdc.gov/datastatistics/index.htmlOccupational Data for HealthH5

Images10.0

Help

0% of images have a clearly defined size

No images are being resized by the browser

Meta tags10.0

Help

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

stats

www.cdc.gov/

CDC is the nation’s leading science-based, data-driven, service organization that protects the public’s health. For more than 70 years, we’ve put science into ...

  • 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/theme-color#075290
www.cdc.gov/descriptionCDC is the nation’s leading science-based, data-driven, service organization that protects the public’s health. For more than 70 years, we’ve put science into action to help children stay healthy so they can grow and learn; to help families, businesses, and communities fight disease and stay strong; and to protect the public’s health.
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:descriptionCDC works 24/7 saving lives and protecting people.
www.cdc.gov/twitter:domainhttps://t.cdc.gov/QK3RL
www.cdc.gov/twitter:image:srchttps://www.cdc.gov/homepage/images/centers-for-disease-control-and-prevention.png?_=78381
www.cdc.gov/robotsindex, archive
www.cdc.gov/dc.date2024-03-20T12:58:47Z
www.cdc.gov/cdc:last_published2024-03-20T15:55:28Z
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/theme-color#075290
www.cdc.gov/spanish/descriptionPágina principal de los Centros para el Control y la Prevención de Enfermedades CDC
www.cdc.gov/spanish/twitter:cardsummary_large_image
www.cdc.gov/spanish/twitter:site@CDCgov
www.cdc.gov/spanish/twitter:creator@CDCespanol
www.cdc.gov/spanish/twitter:titleAcerca de los CDC 24-7
www.cdc.gov/spanish/twitter:descriptionConozca más sobre la misión de los CDC para protegerlo 24-7.
www.cdc.gov/spanish/twitter:image:srchttps://www.cdc.gov/spanish/images/spanish-homepage-social-media_600x300.jpg?_=70023
www.cdc.gov/spanish/robotsindex, archive
www.cdc.gov/spanish/dc.date2024-03-18T02:14:00Z
www.cdc.gov/spanish/cdc:last_published2024-03-18T14:53:58Z
www.cdc.gov/health-topics.htmlviewportwidth=device-width, initial-scale=1, shrink-to-fit=no
www.cdc.gov/health-topics.htmlmobile-web-app-capableyes
www.cdc.gov/health-topics.htmlapple-mobile-web-app-capableyes
www.cdc.gov/health-topics.htmltheme-color#075290
www.cdc.gov/health-topics.htmldescriptionFind diseases and conditions; healthy living; workplace safety; environmental health; injury, violence and safety, global health and more.
www.cdc.gov/health-topics.htmltwitter:cardsummary_large_image
www.cdc.gov/health-topics.htmltwitter:site@CDCgov
www.cdc.gov/health-topics.htmltwitter:creator@CDCgov
www.cdc.gov/health-topics.htmltwitter:titleHealth Topics A-Z
www.cdc.gov/health-topics.htmltwitter:descriptionUse the CDC A-Z Index to find information on various health topics.
www.cdc.gov/health-topics.htmltwitter:domainhttps://t.cdc.gov/00US
www.cdc.gov/health-topics.htmltwitter:image:srchttps://www.cdc.gov/images/Health-topics-sm.jpg?_=92580
www.cdc.gov/health-topics.htmlrobotsindex, archive
www.cdc.gov/health-topics.htmldc.date2024-03-14T06:20:58Z
www.cdc.gov/health-topics.htmlcdc:last_published2024-03-14T18:26:38Z
www.cdc.gov/outbreaks/index.htmlviewportwidth=device-width, initial-scale=1, shrink-to-fit=no
www.cdc.gov/outbreaks/index.htmlmobile-web-app-capableyes
www.cdc.gov/outbreaks/index.htmlapple-mobile-web-app-capableyes
www.cdc.gov/outbreaks/index.htmltheme-color#075290
www.cdc.gov/outbreaks/index.htmldescriptionCurrent outbreak list for both U.S.-based and international travelers - CDC
www.cdc.gov/outbreaks/index.htmltwitter:cardsummary_large_image
www.cdc.gov/outbreaks/index.htmltwitter:site@CDCgov
www.cdc.gov/outbreaks/index.htmltwitter:creator@CDCgov
www.cdc.gov/outbreaks/index.htmltwitter:titleCDC Current Outbreak List
www.cdc.gov/outbreaks/index.htmltwitter:descriptionInfectious disease outbreaks currently being reported on by CDC.
www.cdc.gov/outbreaks/index.htmltwitter:domainhttps://go.usa.gov/xUPXA
www.cdc.gov/outbreaks/index.htmltwitter:image:srchttps://www.cdc.gov/outbreaks/images/CDC_Germ_social_media.png?_=66925
www.cdc.gov/outbreaks/index.htmlrobotsindex, archive
www.cdc.gov/outbreaks/index.htmldc.date2024-02-08T01:29:50Z
www.cdc.gov/outbreaks/index.htmlcdc:last_published2024-02-08T17:09:26Z
www.cdc.gov/datastatistics/index.htmlviewportwidth=device-width, initial-scale=1, shrink-to-fit=no
www.cdc.gov/datastatistics/index.htmlmobile-web-app-capableyes
www.cdc.gov/datastatistics/index.htmlapple-mobile-web-app-capableyes
www.cdc.gov/datastatistics/index.htmltheme-color#075290
www.cdc.gov/datastatistics/index.htmldescriptionData and statistics topics, tools, and related organizations at CDC.
www.cdc.gov/datastatistics/index.htmltwitter:cardsummary_large_image
www.cdc.gov/datastatistics/index.htmltwitter:site@CDCgov
www.cdc.gov/datastatistics/index.htmltwitter:creator@CDCgov
www.cdc.gov/datastatistics/index.htmltwitter:titleData and Statistics
www.cdc.gov/datastatistics/index.htmltwitter:descriptionData and statistics topics, tools, and related organizations at CDC.
www.cdc.gov/datastatistics/index.htmltwitter:domainhttps://t.cdc.gov/BSV
www.cdc.gov/datastatistics/index.htmltwitter:image:srchttps://www.cdc.gov/images/social-media-data-statistics-v2.jpg?_=85568
www.cdc.gov/datastatistics/index.htmlrobotsindex, archive
www.cdc.gov/datastatistics/index.htmldc.date2023-12-29T05:23:06Z
www.cdc.gov/datastatistics/index.htmlcdc:last_published2024-01-03T14:37:08Z

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/health-topics.htmlX-UA-CompatibleIE=Edge
www.cdc.gov/outbreaks/index.htmlX-UA-CompatibleIE=Edge
www.cdc.gov/datastatistics/index.htmlX-UA-CompatibleIE=Edge

Printability10.0

Help

100% of pages are optimised for printing

  • All of this website appears to be optimised for printing (using CSS).

Media specific CSS detected

MediaMin widthMax widthCSS file
only screen-991pxwww.cdc.gov/
only screen-768pxwww.cdc.gov/
print--www.cdc.gov/.../print.min.css?_=07569
only screen-991pxwww.cdc.gov/spanish/
only screen-991pxwww.cdc.gov/health-topics.html
only screen-991pxwww.cdc.gov/datastatistics/index.html
screen-768pxwww.cdc.gov/datastatistics/index.html

Popularity10.0

Help

45103222Estimated monthly organic visitors

  • This website appears to have a high number of monthly website visits each month

Source: Ahrefs

Freshness10.0

Help

Last updated March 20, 2024

  • It looks like this website was last updated on Wednesday, 20 March 2024. 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
20/03/2024www.cdc.gov/Body text
29/12/2023www.cdc.gov/health-topics.htmlBody text
22/12/2023www.cdc.gov/outbreaks/index.htmlBody text
01/02/2024www.cdc.gov/outbreaks/index.htmlBody text
01/01/2024www.cdc.gov/outbreaks/index.htmlBody text
01/12/2023www.cdc.gov/outbreaks/index.htmlBody text
01/05/2023www.cdc.gov/outbreaks/index.htmlBody text
01/02/2023www.cdc.gov/outbreaks/index.htmlBody text
01/12/2022www.cdc.gov/outbreaks/index.htmlBody text
01/05/2022www.cdc.gov/outbreaks/index.htmlBody text
01/01/2020www.cdc.gov/outbreaks/index.htmlBody text
01/08/2019www.cdc.gov/outbreaks/index.htmlBody text
01/02/2019www.cdc.gov/outbreaks/index.htmlBody text
01/01/2019www.cdc.gov/outbreaks/index.htmlBody text
01/03/2017www.cdc.gov/outbreaks/index.htmlBody text
01/03/2024www.cdc.gov/outbreaks/index.htmlBody text
01/09/2022www.cdc.gov/outbreaks/index.htmlBody text
01/08/2022www.cdc.gov/outbreaks/index.htmlBody text
02/09/2022www.cdc.gov/datastatistics/index.htmlBody text
25/01/2024www.cdc.gov/.../Prevent-Measles-720x400px.jpgLast modified header
01/03/2024www.cdc.gov/.../vaccine-blue-720x400px.jpgLast modified header
22/09/2023www.cdc.gov/.../covid-19-green.jpgLast modified header
22/09/2023www.cdc.gov/.../rsv-720x400px.jpgLast modified header
24/08/2023www.cdc.gov/.../cdcdirector-m-cohen.jpgLast modified header
10/09/2018www.cdc.gov/outbreaks/.../localRD.cssLast modified header

Twitteri

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This website does not appear to be associated with a Twitter account.

  • There was a problem checking the Twitter accounts associated with this website.

Domain agei

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

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