micro-organism

There are other infective diseases, in which we have not yet found the causative micro-organism, but we presume its existence.

We do not know the cause of yellow fever despite the claims of Sanarelli that he has isolated the specific micro-organism.

This test is that it cannot be infected again for a long time, if at all, by the same micro-organism.

This he also proved to be caused by a minute form of life, and that fowl cholera is due to still another form of micro-organism.

If I can keep the specific micro-organism that causes hog-cholera off my place, I need not fear the disease.