Anything that is published after 1923 is protected by copyright laws. A work is protected by copyright as soon as it is created in a fixed tangible medium. It need not be registered with the copyright office or have a copyright symbol on it. This applies to articles found on the internet. What your company is doing is likely copyright infringement unless the articles were written prior to 1923 or they have obtained permission from the copyright owner (generally either the author or publisher).
The use that you describe likely does not fall under the "fair use" defense. That defense generally applies when the use of the copyrighted work is one either provides social commentary or parody. Copying an article in full and reprinting it without providing commentary or criticism is copyright infringement. Here is a primer on fair use for more information: http://fairuse.stanford.edu/Copyright_and_Fair_Use_Overview/chapter9/
Please let me know if this answers your question or if you need further clarification.
The information in question is medical information about hepatitis and goes to people with hepatitis c. Does that qualify for social commentary?
No. Social commentary would be taking a quote from the copyrighted work and expressing an opinion about that quote in a new writing.
Taking the entire work and copying it does not fall under fair use.
It would be best to just contact the authors and ask if you can use the work in the newsletter. Given that your company is a non-profit and this is for educational purposes, they will likely say yes.
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