Naturalnews has an agenda and it is “natural” remedies, anti molecular medicine, and pro anti-technological mysticism.
Although in this case they seem to have the basics of the actual charges correct - if not the implications - (i.e. that vaccines in general are made to perpetuate disease).
http://www.pharmalot.com/2012/06/merck-overstated-mumps-vaccine-effectiveness/
Since you don’t give credence to Natural News, how about the following one which was Natural News’ source.
http://www.courthousenews.com/2012/06/27/47851.htm
Natural News cited their source in the article. This was not their bias or slant on this factual information.