Want to find out correct usage of the words "seed" and "seeding" used
in the following context -- or could it be the word "seat"?
1) And then if you've had an injury in that area above the fusion, you
have a combination of the injury plus a possible bacteremia that can
then "seed" that area with bacteria and start an infection going.
2)  And then it depends on if there is any extrinsic cause such as an
injury or an infection or anything that can lead to a "seeding."

You are correct in assuming that the word is "seed."

The word "seed" is being used in this sense:

" seed...
(1) : to inoculate with microorganisms (2) : to inoculate (neighboring
or distant tissues) by dispersion from the parent focus -  used of
bacteria or cancer cells."

~From the Merriam-Webster Third New International Dictionary (Unabridged)

You'll find hundreds of references to "bacterial seeding" on Google:

Google Web Search: "bacterial seeding"
://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=%22bacterial+seeding

I hope this fully answers your question. If anything is unclear,
please request clarification; I'll be glad to offer further assistance
before you rate my answer.

Best wishes,
pinkfreud

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Clarification of Answer by pinkfreud-ga on 17 Mar 2004 16:23 PST

As examples, here are a couple of good quotes that use "seed" and
"seeding" in the medical sense mentioned above:

"He needs to be careful about infections, such as urologic or dental,
because it is possible for the infection to seed bacteria at the hip
replacements."

ALASKA WORKERS' COMPENSATION BOARD 
http://64.233.167.104/search?q=cache:DvPgFoW-eosJ:146.63.134.55/workcomp/1990/90-0181.doc+%22to+seed+bacteria%22&hl=en&lr=lang_en&ie=UTF-8

"Many of your symptoms could be related to your dental abscess. This
infection could be seeding bacteria into your blood stream."

The Respiratory Disorders Forum 
http://www.medhelp.org/forums/RespiratoryDisorders/messages/C1211-4.html