I think it's a pretty good sample of doubtlessly accessible websites. Of course they have put a special effort in getting this label, but somehow it shows that it's possible. I also like the fact that they are pretty diverse in their purposes and target audiences, and are not visually different than the usual production. Which confirms our claims that accessible does not mean boring or not visually appealing - at least, if it's the case, then blame the designer, not accessibility!
Both sites support multiple languages (English and Spanish), and both include lang="es" on the element of the Spanish pages. However, on the CDC site, in addition to lang="es" the element has xml:lang="en". This potentially sends mixed messages to screen readers (is this web page in Spanish or English?) JAWS 13 seems to honor lang rather than xml:lang but I don't know about other screen readers.
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The ADA guidelines are often updated so that businesses can better understand how various disabilities can affect the way that people will interact with websites and digital content. The guidelines also explain why certain barriers can prevent disabled individuals from using or even accessing a website. With these goals in mind, it is important to note that organizations need to review the guidelines on a yearly basis. New technologies, such as Artificial Intelligence10, are being used to help people with disabilities get the most out of the digital world. If organizations fail to read the latest ADA guidelines, then they will soon discover that their approach to web accessibility is outdated, and they might be in violation of digital accessibility laws.

The guidelines are broken down by four main principles: perceivable, operable, understandable, and robust. Under each principle, there are guidelines that provide specific goals a website should work toward. Under each guideline, there are testable success criteria. Those criteria are graded A, AA, or AAA. This grade shows the level of conformity to accessibility, AAA being the highest. The law only requires A and AA guidelines to be met.