The Watchtower, January 1, 1942 page 5 says:
The Watchtower does not consist of men's opinions.
The Golden Age, March 18, 1931 Page 404 says:
Do you know the germ theory has never been proven? And it cannot be proven, either. If it had been proven, it would not be a theory. It has been truly said that knowledge without evidence is superstition, and that applies to the germ theory also. It is a leftover superstition of a past age, when men feared that the earth was inhabited with hideous monsters that were hiding everywhere, in the air, in the sea, in the darkness, etc., always ready to jump out and devour him or make life otherwise miserable for him......We have turned from a gigantic monster theory, to the germs, which are so small that we cannot hear, see, feel, smell, or taste them.
So, this is what Jehovahs spirit directed them to write, huh? And, of course, we know that Jehovah does not change! So, be comforted in knowing that this whole ebola thing is just mans crazy superstition!