Does watching the news every day have a negative effect on mental health?

For example, the world media reported on the Ebola outbreak during the summer of 2014. As broadcasters speculated on the possibility of the virus spreading outside Africa, language was used by the news outlets that instilled fear. Encouraging viewers to fear the worst, they described worst-case scenarios and suggested that "the real fear is that it could mutate into a smarter virus. Turning airborne, it could infect with a single sneeze."