Definition of "microbial"

Many genes with reproductive roles also have antibacterial and immune functions, which indicate that the threat of microbial attack on the sperm or egg may be a major influence on rapid evolution during reproduction.

2013 May-June, Katrina G. Claw, “Rapid Evolution in Eggs and Sperm”, in American Scientist, volume 101, number 3

As I say, one must not blame the Christians too much for all this - partly because, after the communal periods which I have just mentioned, Christianity was evidently deeply influenced by the rise of Commercialism to which during the last two centuries it has so carefully and piously adapted itself; and partly because - if our view is anywhere near right - this microbial injection of self-consciousness was just the necessary work which (in conjunction with commercialism) it had to perform.

1920, Edward Carpenter, Pagan and Christian Creeds, New York: Harcourt, Brace and Co., published 1921, page 191