The Germ by Ogden Nash

The smallest thing
or so it seems
able to bring down the largest Dinosaur
Man

Roar go to work come home and sit on the can
your true inhabitant
follows you through your daily routine
shimmer and sheen
there is bacteria greased lining
in every pocket
of conversational demonstrant

in every speech eloquent
every gesticulate better went by the side-way
by the way
a thank you would be appreciate