Hermetically Porous

I extend into the world
My bodily penumbra
Of life associated
With me, my ecosystem,
Or, actually, my body's,
Or the continental shelf
Of life forms including me,

A microbiome. A home
For genome variety,
A trailing cloud of glory,
However dim, however
Gory the particulars.
I know this because I read
The words, those trickiest germs.